Hello all, I've managed to build a cdf env so that I can read the CEL files for the mapping 10k chip. Using bioconductor 1.4 in R 1.9.0 the pm and mm functions no longer return the probe ids as names. I can get the probe names using probeNames and the pm and mm allows me to get the match/mismatch data. Does anyone know how I can get the sense/antisense and the offset information for each probe? Ive looked in the CDF file and I can't decipher most of it. -- Glenn Stone Leader, Bioinformatics for Human Health http://www.bioinformatics.csiro.au