Embryo mix-ups at fertility clinics are extremely rare.

胚胎搞混了在生育诊所是极其罕见的。

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Former Massachusetts Gov. Mitt Romney opposes using embryos from fertility clinics.

前马萨诸塞州州长罗姆尼反对使用从生育诊所得来的胚胎。

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Fertility clinics have long sought a way to check eggs or embryos for major chromosome abnormalities.

生育专科经过了长期的探索，找到一种途径来检测受精卵或者胚胎以找出主要的异常染色体。

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Many of the fertility clinics that market egg-freezing services already offer options for screening.

WSJ: The Ethics of Egg Freezing

The connection is that embryos for stem cell research primarily come from fertility clinics.

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As the nation's economy is slumping, some fertility clinics say interest in donating has surged.

CNN: Dim economy drives women to donate eggs for profit