Hi, I was wondering if anyone knows the difference between moe430a and moe430av2 affymetrix chips. The cdf packages that get automatically installed with them are are moe430acdf and mouse430a2cdf respectively. The moe430a and moe430av2 chips have the same number of probe sets, the same probe set names and the first 65000 probe sequences (the ones I tested) are identical. I would like to make one expression set out of them so I can normalise all the chips together, but I cannot do so presumably because of the different cdfs. I can bring them in separately but if I bring them in together I get the following error Error in initialize(value, ...) : Cel file C:/Documents and Settings/margar/Desktop/DairyCRC/Palani/430A/C_SO_QSI1A_MOE430A_160704 .CEL does not seem to have the correct dimensions Does anyone know how I might be able to get around this problem? Any suggestions would be much appreciated. Regards Marg P.S I have shown sessionInfo() below R version 2.1.0, 2005-04-18, i386-pc-mingw32 attached base packages: [1] "tools" "methods" "stats" "graphics" "grDevices" "utils" [7] "datasets" "base" other attached packages: moe430acdf mouse430a2cdf affy reposTools Biobase "1.4.3" "1.4.1" "1.6.4" "1.5.15" "1.5.7" >