Two competing theories seek to explain the rare phenomenon of conjoined twins. The first and o
Two competing theories seek to explain the rare phenomenon of conjoined twins. The first and oldest theory is known as fission, in which the first cell divisions of the fertilised egg do not result in complete separation of the twins to begin with. A more recent and more widely accepted contradicting theory, fusion, asserts that two separate embryos form but are rejoined as groups of similar stem cells on either body find each-other and fuse the twins together. It’s curious how radically different and symmetrical theories like this can exist. -- source link
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