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twin sisters
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Twin Sisters

When the division of the developing zygote into 2 embryos occurs, 99% of the time it is within 8 days of fertilization.
Mortality is highest for conjoined twins due to the many complications resulting from shared organs.
If the division of the zygote occurs later than the 12 days then conjoined twins are usually the result.

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Filename:408271.jpg
Album name:People & Humanity
Rating (1 votes):55555
Keywords:#twin #sisters
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Date added:Aug 25, 2011
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