Hi, I have a set of .CEL files obtained using GCOS version of Affy software. ReadAffy() is unable to read these cel files. Can anyone provide me with some info on this. I am using R version 2.01 Any help will be appreciated. Thanks, - Soumyaroop -- Soumyaroop Bhattacharya, MS Analyst Pulmonary Medicine Brigham & Women's Hospital Harvard Medical School Thorn 908 75 Francis Street Boston MA 02115 Phone:(617)732-6265 Fax:(617)232-4623 sbhattacharya@rics.bwh.harvard.edu http://mysite.verizon.net/vzeo1xr3/