US health officials rally behind bid to relax rules on embryo research.
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Erika
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D000818:Animals; D033041:Embryo Research / Q000191:economics / Q000331:legislation & jurisprudence*; D035082:Federal Government; D006801:Humans; D051379:Mice; D009316:National Institutes of Health (U.S.); D013234:Stem Cells; D014481:United States