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Dr. Janet Warrington, a vice president of Affymetrix, holds a DNA micro array chip in Santa Clara, Calif. on Friday, September 8, 2006. The biotechnology firm manufactures the GeneChip micro array which analyzes DNA composition. A study commissioned by the Food and Drug Administration has affirmed the accuracy and validity of the micro array which, until now, had been disputed. Warrington co-authored three of the articles included in the study. PAUL CHINN/The Chronicle **Dr. Janet Warrington Ran on: 09-10-2006 Dr. Janet Warrington, a vice president of Santa Clara's Affymetrix, holds a DNA microarray chip. Ran on: 09-10-2006 (Photo By Paul Chinn/The San Francisco Chronicle via Getty Images)