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STEM CELL HEARING The actual number of stem cell lines available for research may be fewer than the 64 lines cited in the White House policy, members of the Senate Health, Education, Labor, and Pensions Committee acknowledged at a recent hearing. "We know very little about the quality of those existing stem cell lines, except that leading scientists state that up to one-third of them may be so fragile that they will be of no use to any researcher," Sen. Arlen Specter (R-Pa.), says. Other ...