Hello, For the afternoon lab sessions you will need a development version of R and the packages required for each lab. Please see 'Lab Preparation' at https://secure.bioconductor.org/BioC2011/labs.php Install the R-devel version that is available at this location. Please do not use the latest R-devel from svn. Packages required for the labs can be loaded with the scripts available at the bottom of each abstract. Valerie [[alternative HTML version deleted]]