Pregnant mice were irradiated at doses of 250 r from 8-11 days and 300 and 350 r from 8-14 days of pregnancy. A marked effect was found on litter size and on the number of fertilized females which produced no young at term. Three groups of facial vibrissae were scored at birth. The irradiation had a marked effect between 10-12 days of pregnancy at both 300 and 350 r, causing both a doubling and a loss of these structures.
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Fraser et al. (1958) studied this question.
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