Abstract
The growth and development of XO and XX mice were compared from 7 1/4 to 18 1/2 days of gestation. The 7 1/4-day XO egg cylinders were retarded in development (and consequently small) when compared with XX egg cylinders, and this lag in development remained until 10 1/2 days. By 12 1/4 days there was a considerable degree of 'catch-up', but this was not fully maintained. A subgroup of very severely retarded XO fetuses were preferentially located near the cervix. The placentas of XO fetuses were of normal size until 18 1/2 days when they were significantly larger than those of XX controls.
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