Word: freemartins
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Dates: during 1950-1959
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...unanimous conclusion that there had been connections between the placental blood vessels in each pair of twins during gestation. Blood cells in both men contained certain knobs (known as drumsticks, because of shape) usually found only in females. When chimerism occurs in cattle, the female is sterile-a freemartin. Mrs. McK. and Mrs. W. have each had three children, so human chimeras are not freemartins. Despite their originating from separate eggs, they may enjoy at least one of the advantages of identical (one-egg) twins: skin grafts between chimerical twins should "take" permanently...
...cattle, a female twinborn with a male is a freemartin, intersexed and usually sterile. Said the British Medical Journal: Mrs. McK. has had a child and is clearly feminine-no human freemartin...
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