Hello, How do I find the genomic location of each probe (cell)? Specifically, a chromosome # and start site. Is this information stored in a AffymetrixCelSet object? I know the cdf object contains this information, via the AromaCellPositionFile file, but this gives me 4,359,744 probes, where as AffymetrixCelSet gives me 4,691,556. So I was wondering how I could map these two files. I know about the UGP files, but I believe it gives the unit locations, whereas I'm interested in probe location. Thanks, Irene
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