Hi, I have microarray data from Affymetrix Human Genome U133 plus2.0 array to analyze. A previous student in my team analyzed it using Chipster with chiptype of hgu133plus2hsentrezg.db leading to 19425 probes after normalization. When I do the analysis on my way, and upload the CELfile the chiptype is hgu133plus2.db and I obtained 54675 probes after normalization. Could you please explain to me the difference between the two kinds of chiptype and which one I have to use?
Thank you very much for your help!