Hi All, I have 5 CEL files from HGU133A and 5 from HGU133plus2. The first chip type has 22283 genes and the other has 54675 genes. I want to do RMA for all 10 files together taking only 22283 common genes from both chip types. How can I do it?? I would be thankful for your help. Regards, Abhishek Tripathi