Dear Professor,You have told me to load the relevant genomic annotation into R and merge it with the preprocessed data so that I can mine the data of interest.I am wonder that is 'genomic annotation' inside the .ndf file or the phenoData or another file I should load additionally? Moreover, in which step will I load it into R?I have done the preprocessing and read in the annotation using>phenoData(eset)<-read.AnnotatedDataFrame(pd) However, when I write> agrep("GRMZM2G425430_T01",featureNames(eset)) , and some commands like that, the results are still: integer(0) I am eager for your help and looking forward to your reply!!Thank you very much! Sincerely yoursMaggie [[alternative HTML version deleted]]