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Mean (+SEM) number of TUNEL-labeled cells (per 105μm2) in the BC (A) and LA (B) muscles of perinatal mice. Females had a higher density of TUNEL labeling than males (p < 0.0005 in both cases). There was also a significant effect of age on the density of TUNEL-labeled cells in the LA, with a reduction in the rate of cell death between E18 and P1 (p < 0.0005). The number of animals per group is indicated at the base of each bar.
