Weird Science
A recent study in the New England Journal of Medicine showed that a woman who conceived three sons with her husband was biologically unrelated to two of them. Doctors posited that the woman herself was part of an nonidentical-twin pair that fused at an early stage of her mother's pregnancy and that only her blood cells are hers, alone, while cells from her eggs and other tissues may have come from her sister's fetus. [Daily Telegraph (London)-New Scientist, 11-13-03]
