Invitrogen expects to continue its aggressive acquisition strategy through the remainder of the year, but it is possible after a string of relatively small purchases that the firm may be ready to add a "transforming" piece to its business, CEO Greg Lucier suggested during a webcast last week.

Lucier was one of several members of Invitrogen's management to address attendees of the company's 2005 investor meeting at its headquarters in Carlsbad, Calif.

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 Senator Lamar Alexander (R-Tenn.), who chairs the Senate health committee, will be retiring at the end of his term, Stat News reports.

UCSF researchers find that having two X chromosomes may contribute to women's longer lifespans, according to Discover's D-brief blog.

The Wall Street Journal reports on the US Centers for Disease Control and Prevention's use of genetic approaches to study foodborne illnesses.

In PNAS this week: immune cell profiling of wild baboons by social status, metabolomics profiling of esophageal tumors, and more.