2001年，乔治·布什颁发命令，禁止联邦资金支持新胚胎干细胞株的研究，这实际上是一种妥协，意味着科学家们只能对业已产生的胚胎干细胞进行研究。
In 2001 George Bush issued a ban on federal funding of research on new embryonic stem-cell lines-a compromise that meant that scientists could only work with cells from the batches they already had.
尽管2005年在马萨诸塞州对捐助者进行补偿的原因，和对研究者进行付款被禁止，并在2004年，干细胞研究在加利福尼亚倡议。
Despite the reasons for compensating donors, payment for research donations was prohibited in 2005 in Massachusetts and, in 2004, under the stem-cell research initiative in California.
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