Greetings R users, I have a rather specific question I hope someone could assist me with. I have been using the topGO package for some Gene Ontology analysis of some RNA-seq data. As such I use a organism database from the biomaRt library. I can create a topGOdata object with the following command GOdata=new("topGOdata", ontology="BP", allGenes=geneList, nodeSize=10, annot=annFUN.org, mapping="org.Ss.eg.db", ID="Symbol") Everything works well except when I wish to look at the genes within an individual GO where I can't get the function to work. I initially thought to try this because I don't use a microarray library: gt=printGenes(GOdata, whichTerms = goID, chip="org.Ss.eg.db", numChar = 40) but I received the error: Error in get(paste(chip, "ENTREZID", sep = "")): object 'org.Ss.egENTREZID' not found Has anyone experienced this or have any thoughts? Regards, -- Charles Determan Integrated Biosciences PhD Student University of Minnesota [[alternative HTML version deleted]]