In what promises to be a repeat performance from 2006, the U.S. Senate tomorrow (April 10) will begin two days of vigorous debate followed by votes on measures to expand federal funding of human embryonic stem cell research. And like last year, President George W. Bush has promised to veto the main bill (HR 3/S 5), which would extend federal research funding to newly derived cell lines. The House last year was unable to over-ride Bush's veto after Congress approved the measure. The House passed this year's version of the bill in January, but the vote (253 to 164) fell far short of the number necessary to over-ride another veto. (Both the House and Senate must each have at least a two-thirds majority to over-ride a presidential veto.)As a result, supporters hope to shift the legislative battle to the Senate, where the chances of achieving a...

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