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Mean volume (± SEM) of the BC and LA muscles in perinatal mice. Muscle volumes are similar in both sexes on E16. (A) A significant sex difference in BC size is first seen on E17, and the magnitude of the difference increases postnatally. No BC was found in any female on P3 or P5. (B) A sex difference in LA size emerges on E18 and increases at later ages. Females retained a small LA at all ages examined. #, p < 0.05; *, p < 0.0005.
