• Affymetrix Inc., of Santa Clara, Calif., said it reacquired all marketing rights to its GeneChip gene expression analysis products developed under a 1994 collaboration with Hewlett-Packard Co., of Palo Alto, Calif. In revising the alliance, Affymetrix also expanded rights to sell as part of the GeneChip system a GeneArray scanner, which also emerged from the companies’ work. The scanner is designed to speed analysis on the GeneChip’s DNA probe