AS TWIN pregnancies go, it was happily uneventful. The identical baby girls lazed in the comfort of their mother's belly until they were full term and born in a Dutch hospital. But after their birth, doctors noticed something was wrong. One girl was quite normal. The other had two vaginas, two colons and a spinal cord that split in two towards the bottom of her back.
It was the beginning of two new lives, and of years of surgery and care for one of the twins. It was also the start of a biological mystery that took the best part of a decade to solve. From looking at the placenta, doctors knew the girls were identical twins. So how could twins who shared the same genes be so different?
It is well known that identical twins can grow into very different adults, and not just with respect to their ...
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