NEW YORK (GenomeWeb News) – Shares of Affymetrix and Helicos BioSciences dropped sharply in October, as 28 of the 34 stocks in the GenomeWeb Daily News Index lost value during the month.

Those two firms were the biggest decliners among a group of five stocks that dropped more than 20 percent. Affy fell 40 percent and Helicos dropped 34 percent, while Decode Genetics tumbled 33 percent amid its continued financial difficulties, Illumina sank 24 percent, and Caliper Life Sciences fell 22 percent.

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Microsoft co-founder Paul Allen also contributed to brain research, NPR reports.

The New York Times reports on the shifting interpretations of what some genetic variants mean over time.

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MIT's Technology Review reports on Genentech's pursuit of personalized cancer vaccines.