During pregnancy, some cells travel from mother to baby and some go from baby to mother. A fraction may persists in their new host. The intermingling of some cells from one person inside the body of another is the phenomenon known as microchimerism. Chimera in mythology combines parts of different animals – a lion, a goat and a snake. A person who harbors the cells of another person is said to be mirochimeric because relatively few cells are involved. It is now drawing intense scrutiny from medical researchers, because recent work suggests it may contribute to both health and disease.
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