Automation and Visualization of Flow Cytometry Data Analysis Pipelines
24 October 2023
Abstract
This vignette describes the functionality implemented in the CytoPipeline package. CytoPipeline provides support for automation and visualization of flow cytometry data analysis pipelines. In the current state, the package focuses on the pre-processing and quality control part. This vignette is distributed under a CC BY-SA 4.0 license.
Package
CytoPipeline 1.2.0
1 Installation
To install this package, start R and enter (uncommented):
# if (!require("BiocManager", quietly = TRUE))
# install.packages("BiocManager")
#
# BiocManager::install("CytoPipeline")Note that CytoPipeline imports ggplot2 (>= 3.4.1).
The version requirement is due to a bug in version 3.4.0.,
affecting ggplot2::geom_hex().
2 Introduction
The CytoPipeline package provides infrastructure to support the definition,
run and standardized visualization of pre-processing and quality control
pipelines for flow cytometry data. This infrastructure consists of two main S4
classes, i.e. CytoPipeline and CytoProcessingStep, as well as dedicated
wrapper functions around selected third-party package methods often used to
implement these pre-processing steps.
In the following sections, we demonstrate how to create a CytoPipeline
object implementing a simple pre-processing pipeline, how to run it and
how to retrieve and visualize the results after each step.
3 Example dataset
The example dataset that will be used throughout this vignette is derived from a reference public dataset accompanying the OMIP-021 (Optimized Multicolor Immunofluorescence Panel 021) article (Gherardin et al. 2014).
A sub-sample of this public dataset is built-in in the CytoPipeline
package, as the OMIP021 dataset.
See the MakeOMIP021Samples.R script for more details
on how the OMIP021 dataset was created. This script is to be found
in the script subdirectory in the CytoPipeline package installation path.
Note that in the CytoPipelinepackage, as in the current vignette,
matrices of flow cytometry events intensities are stored as
flowCore::flowFrame objects (Ellis B 2022).
4 Example of pre-processing and QC pipelines
Let’s assume that we want to pre-process the two samples of the OMIP021
dataset, and let’s assume that we want to compare what we would obtain when
pre-processing these files using two different QC methods.
In the first pre-processing pipeline, we will use the flowAI QC method (Monaco et al. 2016), while in the second pipeline, we will use the PeacoQC method (Emmaneel et al. 2021). Note that when we here refer to QC method, we mean the algorithm used to ensure stability (stationarity) of the channel signals in time.
In both pipelines, the first part consists in estimating appropriate scale
transformation functions for all channels present in the sample flowFrame.
In order to do this, we propose the following scale transformation processing
queue (Fig. 1):
- reading the two samples
.fcsfiles - removing the margin events from each file
- applying compensation for each file
- aggregating and sub-sampling from each file
- estimating the scale transformations from the aggregated and sub-sampled data
Figure 1: Scale transform processing queue
When this first part is done, one can apply pre-processing for each file one by one. However, depending on the choice of QC method, the order of steps needs to be slightly different:
- when using flowAI, it is advised to eliminate the ‘bad events’ starting from raw data (see (Monaco et al. 2016))
- when using PeacoQC, it is advised to eliminate the ‘bad events’ from already compensated and scale transformed data (see (Emmaneel et al. 2021))
Therefore, we propose the following pre-processing queues represented in Fig. 2.
Figure 2: Pre-processing queue for two different pipeline settings
5 Building the CytoPipeline
CytoPipeline is the central S4 class used in the CytoPipeline package to
represent a flow cytometry pre-processing pipeline. The main slots of
CytoPipeline objects are :
an
experimentName, which gives a name to a particular user definition of a pre-processing pipeline. The experiment here, is not related to an assay experiment, but refers to a specific way to design a pipeline. For example, in the current use case, we will define twoexperimentNames, one to refer to the flowAI pipeline, and another one to refer to the PeacoQC pipeline (see previous section);a vector of
sampleFiles, which are.fcsraw data files on which one need to run the pre-processing pipeline;two processing queues, i.e. a
scaleTransformProcessingQueue, and aflowFramesPreProcessingQueue, which correspond to the two parts described in previous section. Each of these queues are composed of one or severalCytoProcessingStepobjects, will be processed in linear sequence, the output of one step being the input of the next step.
Note there are important differences between the two processing queues.
On the one hand, the scaleTransformProcessingQueue takes the vector of all
sample files as an input, and will be executed first, and only once.
On the other hand, the flowFramesPreProcessingQueue will be run after the
scale transformation processing queue, on each sample file one after the other,
within a loop. The final output of the scaleTransformProcessingQueue, which
should be a flowCore::tranformList, is also provided as input to the
flowFramesPreProcessingQueue, by convention.
In the next subsections, we show the different steps involved in creating a
CytoPipeline object.
5.1 preliminaries: paths definition
In the following code, rawDataDir refers to the directory in which the .fcs
raw data files are stored. workDir will be used as root directory to store
the disk cache. Indeed, when running the CytoPipeline objects, all the
different step outputs will be stored in a BiocFileCache instance, in a
sub-directory that will be created in workDirand of which the name will be
set to the pipeline experimentName.
library(CytoPipeline)
# raw data
rawDataDir <- system.file("extdata", package = "CytoPipeline")
# output files
workDir <- suppressMessages(base::tempdir())5.2 first method: step by step, using CytoPipeline methods
In this sub-section, we build a CytoPipeline object and successively add
CytoProcessingStep objects to the two different processing queues. We do this
for the PeacoQC pipeline.
# main parameters : sample files and output files
experimentName <- "OMIP021_PeacoQC"
sampleFiles <- file.path(rawDataDir, list.files(rawDataDir,
pattern = "Donor"))
pipL_PeacoQC <- CytoPipeline(experimentName = experimentName,
sampleFiles = sampleFiles)
### SCALE TRANSFORMATION STEPS ###
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "scale transform",
CytoProcessingStep(
name = "flowframe_read",
FUN = "readSampleFiles",
ARGS = list(
whichSamples = "all",
truncate_max_range = FALSE,
min.limit = NULL
)
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "scale transform",
CytoProcessingStep(
name = "remove_margins",
FUN = "removeMarginsPeacoQC",
ARGS = list()
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "scale transform",
CytoProcessingStep(
name = "compensate",
FUN = "compensateFromMatrix",
ARGS = list(matrixSource = "fcs")
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "scale transform",
CytoProcessingStep(
name = "flowframe_aggregate",
FUN = "aggregateAndSample",
ARGS = list(
nTotalEvents = 10000,
seed = 0
)
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "scale transform",
CytoProcessingStep(
name = "scale_transform_estimate",
FUN = "estimateScaleTransforms",
ARGS = list(
fluoMethod = "estimateLogicle",
scatterMethod = "linear",
scatterRefMarker = "BV785 - CD3"
)
)
)
### FLOW FRAME PRE-PROCESSING STEPS ###
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "flowframe_read",
FUN = "readSampleFiles",
ARGS = list(
truncate_max_range = FALSE,
min.limit = NULL
)
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "remove_margins",
FUN = "removeMarginsPeacoQC",
ARGS = list()
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "compensate",
FUN = "compensateFromMatrix",
ARGS = list(matrixSource = "fcs")
)
)
pipL_PeacoQC <-
addProcessingStep(
pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "perform_QC",
FUN = "qualityControlPeacoQC",
ARGS = list(
preTransform = TRUE,
min_cells = 150, # default
max_bins = 500, # default
step = 500, # default,
MAD = 6, # default
IT_limit = 0.55, # default
force_IT = 150, # default
peak_removal = 0.3333, # default
min_nr_bins_peakdetection = 10 # default
)
)
)
pipL_PeacoQC <-
addProcessingStep(
pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "remove_doublets",
FUN = "removeDoubletsCytoPipeline",
ARGS = list(
areaChannels = c("FSC-A", "SSC-A"),
heightChannels = c("FSC-H", "SSC-H"),
nmads = c(3, 5))
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "remove_debris",
FUN = "removeDebrisManualGate",
ARGS = list(
FSCChannel = "FSC-A",
SSCChannel = "SSC-A",
gateData = c(73615, 110174, 213000, 201000, 126000,
47679, 260500, 260500, 113000, 35000)
)
)
)
pipL_PeacoQC <-
addProcessingStep(pipL_PeacoQC,
whichQueue = "pre-processing",
CytoProcessingStep(
name = "remove_dead_cells",
FUN = "removeDeadCellsManualGate",
ARGS = list(
FSCChannel = "FSC-A",
LDMarker = "L/D Aqua - Viability",
gateData = c(0, 0, 250000, 250000,
0, 650, 650, 0)
)
)
)5.3 second method: in one go, using JSON file input
In this sub-section, we build the flowAI pipeline, this time using a JSON
file as an input. Note that the experimentName and sampleFiles are here
specified in the JSON file itself. This is not necessary, as
one could well specify the processing steps only in the JSON file, and
pass the experimentName and sampleFiles directly
in the CytoPipeline constructor.
jsonDir <- rawDataDir
# creation on CytoPipeline object,
# using json file as input
pipL_flowAI <-
CytoPipeline(file.path(jsonDir, "OMIP021_flowAI_pipeline.json"),
experimentName = "OMIP021_flowAI",
sampleFiles = sampleFiles)6 Executing pipelines
6.1 Executing PeacoQC pipeline
Note: executing the next statement might generate some warnings.
These are generated by the PeacoQC method, are highly dependent
on the shape of the data investigated, and can safely be ignored here.
# execute PeacoQC pipeline
execute(pipL_PeacoQC, path = workDir)## ####################################################### ### running SCALE TRANSFORMATION processing steps ##### ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [remove_margins] ...## Removing margins from file : Donor1.fcs## Warning in PeacoQC::RemoveMargins(ff, channels = channel4Margins,
## channel_specifications = PQCChannelSpecs): More than 10.12 % is considered as a
## margin event in file Donor1.fcs . This should be verified.## Removing margins from file : Donor2.fcs## Proceeding with step 3 [compensate] ...## Compensating file : Donor1.fcs## Compensating file : Donor2.fcs## Proceeding with step 4 [flowframe_aggregate] ...## Proceeding with step 5 [scale_transform_estimate] ...## estimating logicle transformations for fluorochrome channels...## Estimating linear transformation for scatter channels : reference marker = BV785 - CD3...## applying specific linear transformation for FSC-A channel...## initial quantiles : q5 = 48809.1266 ; q95 = 182769.1664## target quantiles : q5 = 0.3996 ; q95 = 2.9603## a = 1.91e-05 ; b = -5.33e-01## applying FSC-A linear transformation for FSC-H channel...## applying specific linear transformation for SSC-A channel...## initial quantiles : q5 = 41296.8164 ; q95 = 223620.1273## target quantiles : q5 = 0.3996 ; q95 = 2.9603## a = 1.40e-05 ; b = -1.80e-01## applying SSC-A linear transformation for SSC-H channel...## ####################################################### ### NOW PRE-PROCESSING FILE /tmp/RtmpeYC8Zf/Rinst24ebbf2e8bf8/CytoPipeline/extdata/Donor1.fcs...## ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [remove_margins] ...## Removing margins from file : Donor1.fcs## Warning in PeacoQC::RemoveMargins(ff, channels = channel4Margins,
## channel_specifications = PQCChannelSpecs): More than 10.12 % is considered as a
## margin event in file Donor1.fcs . This should be verified.## Proceeding with step 3 [compensate] ...## Compensating file : Donor1.fcs## Proceeding with step 4 [perform_QC] ...## Applying PeacoQC method...## Starting quality control analysis for Donor1.fcs## Warning in FindIncreasingDecreasingChannels(breaks, ff, channels, plot, : There
## seems to be an increasing or decreasing trend in a channel for Donor1.fcs .
## Please inspect this in the overview figure.## Calculating peaks## Warning in PeacoQC::PeacoQC(ff = ffIn, channels = channel4QualityControl, :
## There are not enough bins for a robust isolation tree analysis.## MAD analysis removed 38.81% of the measurements## The algorithm removed 38.81% of the measurements## Proceeding with step 5 [remove_doublets] ...## Proceeding with step 6 [remove_debris] ...## Proceeding with step 7 [remove_dead_cells] ...## ####################################################### ### NOW PRE-PROCESSING FILE /tmp/RtmpeYC8Zf/Rinst24ebbf2e8bf8/CytoPipeline/extdata/Donor2.fcs...## ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [remove_margins] ...## Removing margins from file : Donor2.fcs## Proceeding with step 3 [compensate] ...## Compensating file : Donor2.fcs## Proceeding with step 4 [perform_QC] ...## Applying PeacoQC method...## Starting quality control analysis for Donor2.fcs## Warning in FindIncreasingDecreasingChannels(breaks, ff, channels, plot, : There
## seems to be an increasing or decreasing trend in a channel for Donor2.fcs .
## Please inspect this in the overview figure.## Calculating peaks## Warning in PeacoQC::PeacoQC(ff = ffIn, channels = channel4QualityControl, :
## There are not enough bins for a robust isolation tree analysis.## MAD analysis removed 9.57% of the measurements## The algorithm removed 9.57% of the measurements## Proceeding with step 5 [remove_doublets] ...## Proceeding with step 6 [remove_debris] ...## Proceeding with step 7 [remove_dead_cells] ...6.2 Executing flowAI pipeline
Note: again this might generate some warnings, due to flowAI.
These are highly dependent on the shape of the data investigated,
and can safely be ignored here.
# execute flowAI pipeline
execute(pipL_flowAI, path = workDir)## ####################################################### ### running SCALE TRANSFORMATION processing steps ##### ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [remove_margins] ...## Removing margins from file : Donor1.fcs## Warning in PeacoQC::RemoveMargins(ff, channels = channel4Margins,
## channel_specifications = PQCChannelSpecs): More than 10.12 % is considered as a
## margin event in file Donor1.fcs . This should be verified.## Removing margins from file : Donor2.fcs## Proceeding with step 3 [compensate] ...## Compensating file : Donor1.fcs## Compensating file : Donor2.fcs## Proceeding with step 4 [flowframe_aggregate] ...## Proceeding with step 5 [scale_transform_estimate] ...## estimating logicle transformations for fluorochrome channels...## Estimating linear transformation for scatter channels : reference marker = BV785 - CD3...## applying specific linear transformation for FSC-A channel...## initial quantiles : q5 = 48809.1266 ; q95 = 182769.1664## target quantiles : q5 = 0.3996 ; q95 = 2.9603## a = 1.91e-05 ; b = -5.33e-01## applying FSC-A linear transformation for FSC-H channel...## applying specific linear transformation for SSC-A channel...## initial quantiles : q5 = 41296.8164 ; q95 = 223620.1273## target quantiles : q5 = 0.3996 ; q95 = 2.9603## a = 1.40e-05 ; b = -1.80e-01## applying SSC-A linear transformation for SSC-H channel...## ####################################################### ### NOW PRE-PROCESSING FILE /tmp/RtmpeYC8Zf/Rinst24ebbf2e8bf8/CytoPipeline/extdata/Donor1.fcs...## ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [perform_QC] ...## Applying flowAI method...## Quality control for the file: Donor1
## 3.18% of anomalous cells detected in the flow rate check.
## 0% of anomalous cells detected in signal acquisition check.
## 0.12% of anomalous cells detected in the dynamic range check.## Proceeding with step 3 [compensate] ...## Compensating file : Donor1.fcs## Proceeding with step 4 [remove_doublets] ...## Proceeding with step 5 [remove_debris] ...## Proceeding with step 6 [remove_dead_cells] ...## ####################################################### ### NOW PRE-PROCESSING FILE /tmp/RtmpeYC8Zf/Rinst24ebbf2e8bf8/CytoPipeline/extdata/Donor2.fcs...## ####################################################### Proceeding with step 1 [flowframe_read] ...## Proceeding with step 2 [perform_QC] ...## Applying flowAI method...## Quality control for the file: Donor2
## 4.52% of anomalous cells detected in the flow rate check.
## 0% of anomalous cells detected in signal acquisition check.
## 0.1% of anomalous cells detected in the dynamic range check.## Proceeding with step 3 [compensate] ...## Compensating file : Donor2.fcs## Proceeding with step 4 [remove_doublets] ...## Proceeding with step 5 [remove_debris] ...## Proceeding with step 6 [remove_dead_cells] ...7 Inspecting results and visualization
7.1 Plotting processing queues as workflow graphs
# plot work flow graph - PeacoQC - scale transformList
plotCytoPipelineProcessingQueue(
pipL_PeacoQC,
whichQueue = "scale transform",
path = workDir)
Figure 3: PeacoQC pipeline - scale transformList processing queue
# plot work flow graph - PeacoQC - pre-processing
plotCytoPipelineProcessingQueue(
pipL_PeacoQC,
whichQueue = "pre-processing",
sampleFile = 1,
path = workDir)
Figure 4: PeacoQC pipeline - file pre-processing queue
# plot work flow graph - flowAI - scale transformList
plotCytoPipelineProcessingQueue(
pipL_flowAI,
whichQueue = "scale transform",
path = workDir)
Figure 5: flowAI pipeline - scale transformList processing queue
# plot work flow graph - flowAI - pre-processing
plotCytoPipelineProcessingQueue(
pipL_flowAI,
whichQueue = "pre-processing",
sampleFile = 1,
path = workDir)
Figure 6: flowAI pipeline - file pre-processing queue
7.2 Obtaining information about pipeline generated objects
getCytoPipelineObjectInfos(pipL_PeacoQC,
path = workDir,
whichQueue = "scale transform")## ObjectName ObjectClass
## 1 flowframe_read_obj flowSet
## 2 remove_margins_obj flowSet
## 3 compensate_obj flowSet
## 4 flowframe_aggregate_obj flowFrame
## 5 scale_transform_estimate_obj transformListgetCytoPipelineObjectInfos(pipL_PeacoQC,
path = workDir,
whichQueue = "pre-processing",
sampleFile = sampleFiles(pipL_PeacoQC)[1])## ObjectName ObjectClass
## 1 flowframe_read_obj flowFrame
## 2 remove_margins_obj flowFrame
## 3 compensate_obj flowFrame
## 4 perform_QC_obj flowFrame
## 5 remove_doublets_obj flowFrame
## 6 remove_debris_obj flowFrame
## 7 remove_dead_cells_obj flowFrame7.3 Retrieving flow frames at different steps and plotting them
# example of retrieving a flow frame
# at a given step
ff <- getCytoPipelineFlowFrame(
pipL_PeacoQC,
whichQueue = "pre-processing",
sampleFile = 1,
objectName = "remove_doublets_obj",
path = workDir)
#
ff2 <- getCytoPipelineFlowFrame(
pipL_PeacoQC,
whichQueue = "pre-processing",
sampleFile = 1,
objectName = "remove_debris_obj",
path = workDir)ggplotEvents(ff, xChannel = "FSC-A")
Figure 7: 1-dimensional distribution plot (forward scatter channel)
ggplotEvents(ff, xChannel = "FSC-A", yChannel = "SSC-A")
Figure 8: 2-dimensional distribution plot (forward scatter vs. side scatter channels)
ggplotFilterEvents(ff, ff2, xChannel = "FSC-A", yChannel = "SSC-A")
Figure 9: 2-dimensional difference plot between remove_doublets and remove_debris steps
7.4 Example of retrieving another type of object
We now provide an example on how to retrieve an object from the cache, that
is not specifically a flowCore::flowFrame.
Here we retrieve a flowCore::flowSet object, which represents a set of
flowCore::flowFrameobjects, that was obtained after the compensation step
of the scale transformation processing queue, prior to aggregating the
two samples.
obj <- getCytoPipelineObjectFromCache(pipL_PeacoQC,
path = workDir,
whichQueue = "scale transform",
objectName = "compensate_obj")
show(obj)## A flowSet with 2 experiments.
##
## column names(22): FSC-A FSC-H ... Time Original_ID7.5 Interactive visualization
Using the CytoPipelineGUI package, it is possible to interactively inspect
results at the different steps of the pipeline, either in the form of
flowCore::flowFrame objects, or flowCore::transformList.
To do this, install the CytoPipelineGUI package, and uncomment
the following code:
#devtools::install_github("https://github.com/UCLouvain-CBIO/CytoPipelineGUI")
#CytoPipelineGUI::CytoPipelineCheckApp(dir = workDir)8 Adding function wrappers - note on the CytoPipelineUtils package
As was described in the previous sections, CytoPipeline requires the user to
provide wrappers to pre-processing functions, as FUN parameter of
CytoProcessingSteps. These can be coded by the user themself, or
come from a built-in function provided in CytoPipeline itself.
However, in order to avoid having too many external dependencies for
CytoPipeline, another package CytoPipelineUtils, is also
available
CytoPipelineUtils is meant to be used in conjunction with CytoPipeline
package. It is a helper package, which is aimed at hosting wrapper
implementations of various functions of various packages.
CytoPipelineUtils is open to contributions. If you want to implement your
own wrapper of your favourite pre-processing function and use it in a
CytoPipeline object, this is the place to do it!
Session information
## R version 4.3.1 (2023-06-16)
## Platform: x86_64-pc-linux-gnu (64-bit)
## Running under: Ubuntu 22.04.3 LTS
##
## Matrix products: default
## BLAS: /home/biocbuild/bbs-3.18-bioc/R/lib/libRblas.so
## LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.10.0
##
## locale:
## [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
## [3] LC_TIME=en_GB LC_COLLATE=C
## [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
## [7] LC_PAPER=en_US.UTF-8 LC_NAME=C
## [9] LC_ADDRESS=C LC_TELEPHONE=C
## [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
##
## time zone: America/New_York
## tzcode source: system (glibc)
##
## attached base packages:
## [1] stats graphics grDevices utils datasets methods base
##
## other attached packages:
## [1] CytoPipeline_1.2.0 BiocStyle_2.30.0
##
## loaded via a namespace (and not attached):
## [1] changepoint_2.2.4 tidyselect_1.2.0 farver_2.1.1
## [4] dplyr_1.1.3 blob_1.2.4 filelock_1.0.2
## [7] fastmap_1.1.1 BiocFileCache_2.10.0 XML_3.99-0.14
## [10] digest_0.6.33 lifecycle_1.0.3 cluster_2.1.4
## [13] RSQLite_2.3.1 magrittr_2.0.3 compiler_4.3.1
## [16] rlang_1.1.1 sass_0.4.7 tools_4.3.1
## [19] utf8_1.2.4 yaml_2.3.7 data.table_1.14.8
## [22] knitr_1.44 labeling_0.4.3 bit_4.0.5
## [25] curl_5.1.0 diagram_1.6.5 plyr_1.8.9
## [28] RColorBrewer_1.1-3 withr_2.5.1 purrr_1.0.2
## [31] RProtoBufLib_2.14.0 BiocGenerics_0.48.0 PeacoQC_1.12.0
## [34] grid_4.3.1 stats4_4.3.1 fansi_1.0.5
## [37] flowAI_1.32.0 colorspace_2.1-0 ggplot2_3.4.4
## [40] scales_1.2.1 iterators_1.0.14 cli_3.6.1
## [43] rmarkdown_2.25 crayon_1.5.2 ncdfFlow_2.48.0
## [46] generics_0.1.3 reshape2_1.4.4 httr_1.4.7
## [49] rjson_0.2.21 DBI_1.1.3 cachem_1.0.8
## [52] flowCore_2.14.0 stringr_1.5.0 zlibbioc_1.48.0
## [55] parallel_4.3.1 BiocManager_1.30.22 matrixStats_1.0.0
## [58] vctrs_0.6.4 jsonlite_1.8.7 cytolib_2.14.0
## [61] bookdown_0.36 IRanges_2.36.0 GetoptLong_1.0.5
## [64] S4Vectors_0.40.0 bit64_4.0.5 clue_0.3-65
## [67] Rgraphviz_2.46.0 magick_2.8.1 foreach_1.5.2
## [70] jquerylib_0.1.4 hexbin_1.28.3 glue_1.6.2
## [73] codetools_0.2-19 stringi_1.7.12 gtable_0.3.4
## [76] shape_1.4.6 ggcyto_1.30.0 ComplexHeatmap_2.18.0
## [79] munsell_0.5.0 tibble_3.2.1 pillar_1.9.0
## [82] htmltools_0.5.6.1 graph_1.80.0 circlize_0.4.15
## [85] R6_2.5.1 dbplyr_2.3.4 doParallel_1.0.17
## [88] evaluate_0.22 flowWorkspace_4.14.0 lattice_0.22-5
## [91] Biobase_2.62.0 png_0.1-8 memoise_2.0.1
## [94] bslib_0.5.1 Rcpp_1.0.11 gridExtra_2.3
## [97] xfun_0.40 zoo_1.8-12 pkgconfig_2.0.3
## [100] GlobalOptions_0.1.2References
Ellis B, Hahne F, Haaland P. 2022. flowCore: Basic Structures for Flow Cytometry Data. https://bioconductor.org/packages/flowCore/.
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