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The mutation rate at seven specific loci was measured among the offspring of male and female mice exposed as 17½-day-old foetuses to 200 r. X-rays. In the female series the mutation rate was lower, by a factor of about four, than the comparable adult rate; in the male series the mutation rate was lower but not statistically significantly lower than in adults.
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Carter et al. (1960) studied this question.
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