BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Two-headed infant. Coloured X-ray of conjoined (siamese) twins. Each twin has its own head, neck and trachea (windpipe), but shares the rest of the body. Most two-headed infants are stillborn or die soon after birth. As with identical twins, conjoined twins result from the fertilisation of a single egg cell, but with conjoined twins the spitting of the embryo is incomplete.
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