The Fetal Farming Bill of 2006, which prohibits "the solicitation or acceptance of tissue from embryos gestated for research purposes."
2006年的胚胎培育法案，该法案禁止“捐献或接受从为研究目的所培育的胚胎中取得的组织”。
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The theory is that because these stem cells are fetal cells, they are designed to proliferate and give rise to new tissue, which means they have the potential to produce tumors.