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Article: Conjoined twins originate from single fertilised egg

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New Straits Times
Article date:
September 15, 2002
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New Straits Times
09-15-2002
Conjoined twins originate from single fertilised egg
Edition: 2*

SIAMESE twins originate from a single fertilised egg which due to genetic and environmental conditions fails to separate after the 13th day of fertilisation.

The developing embryo starts to split into identical twins within the first two weeks after conception but then stops before completion, leaving a partially separated egg which matures into a conjoined foetus.
Studies show that conjoined twins are more often female than male with the ratio of 3:1. A rare case of conjoined male-female twins was born in 1957 as reported in the 1988 book Twinning and Twins.

It was suspected that ...

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