Bioinformatics Department, Affymetrix, Inc, 6550 Vallejo Street, Ste 100, Emeryville, CA 94608, USA. ann_loraine@affymetrix.com|Bioinformatics Department, Affymetrix, Inc, 6550 Vallejo Street, Ste 100, Emeryville, CA 94608, USA. ann_loraine@affymetrix.com