oposSOM 1.5.4: A bug was fixed, which was caused by an altered function from igraph package. oposSOM 1.7.1: Bumped version number by Bioconductor + a series of bugs were fixed. oposSOM 1.7.2: Fixed few bugs & changed host for database access due to biomart downtime. oposSOM 1.7.3: Fixed another critical biomart bug. Presentation of correlation based similarity analyses and gene set reports improved. oposSOM 1.9.0: Implemented analysis of expression module activation patterns (PATa). Enable automatic estimation of SOM size and automatic grouping of samples according to PATs. Performance improved. oposSOM 1.9.1: Minor fixes and code improvements. oposSOM 1.9.2: Bug fixes and presentation improvements.