Hi, I think the problem is in the downloading of the contents of the packages, when I enter library() the packages appear to be there, but then I can't access them. > library(Biobase) Loading required package: tools > library() > library(golubEsets) > hist(exprs(golubMerge)) Error in hist(exprs(golubMerge)) : couldn't find function "exprs" > exprs(golubMerge) Error: couldn't find function "exprs" Data set 'geneData' not found in: data(geneData) > data(geneCov) Warning message: Data set 'geneCov' not found in: data(geneCov) I'm using the most recent getBioC() from the website, and have tried downloading everything at once, as well as packages separately. I'm using a Mac OSX 10.3 and have also tried turning off the firewall prior to downloading, but that hasn't seemed to make a difference. thanks, Katie