President Bush has vetoed a bill that would permit federal support for research utilizing human embryonic stem cells, regardless of when the stem cell lines were derived. It was the third veto of Bush's presidency, and the second time he has vetoed embryonic stem-cell research legislation. On the same day as his veto, Bush signed an executive order that would expand the kinds of stem-cell lines tracked by the National Institutes of Health. Bush's order requires the NIH to add known adult stem-cell lines to the Embryonic Stem Cell Registry, and renames the database the Pluripotent Stem Cell Registry. The current registry tracks only human embryonic stem-cell lines. A Senate vote to override Bush's veto is likely to fail, but alternatively, lawmakers are discussing adding a stem-cell provision to the fiscal year 2008 appropriations bill funding the NIH. On Thursday, the Senate Appropriations Committee included language in the committee's version of that bill that would allow grants for the use of approximately 400 human embryonic stem cell lines created before June 15.