For years, private financing has been used to create embryonic stem cell lines, mostly from discarded embryos from fertility clinics.

多年来，私人资金已用于制造胚胎干细胞系，绝大多数是从妇产科医院丢弃的胚胎中制造出来的。

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They can, however, generate "uniparental" embryonic stem cell lines. Uniparental embryos with two maternal sets of chromosomes are known as parthenogenetic.

但是，他们可以产生“单系”胚胎干细胞系，带有母系的两组染色体的单系胚胎被称为单性生殖。

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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.

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。

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A. Non-embryonic stem cell lines involve cells that are more differentiated and thus less capable of being programmed into various cell lines.

CNN: Dr. Sanjay Gupta: Understanding stem cell research

Why not do this research with non-embryonic stem cell lines?

CNN: Dr. Sanjay Gupta: Understanding stem cell research

Doerflinger said his group is in favor of federal funding of research on non-embryonic stem cell lines, using adult tissue, or tissue from fetuses which died of natural causes.

CNN: Bush said to be 'struggling' with stem cell decision