>Our local paper just carried a story about a couple who just gave birth to
>quads. Mom had in vitro but they ONLY transplanted two eggs, so the theory
>is both eggs split, of course there are two boys and two girls. All their
>weights were 4 pounds and over.\
I don't have ther references in front of me, but it appears that some
types of embryo manipulation lead to an increase in the rate of
identical twinning.
Nick

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Nick Theodorakis
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