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Distribution of sex and weight in the PO × F1 cross at postnatal day 45. Vertical axis represents number of animals, horizontal axis indicates body weight in grams. Parental mean body weights ( ± one standard deviation) are as follows : PO♀ = 15.3 ± 1.2, PO♂ = 12.4 ± 0.4, BW♀ = 15.5 ± 1.6, BW♂ = 17.4 ± 1.4.
