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Developmental changes in CD1 (hatched bars) and C57B1/6 (B6; solid bars) mice during late gestation. Litter sizes (A), fetal weights (B), and placental weights (C) are shown as means ± SE. ANOVA showed that litter was a significant source of variation in fetal and placental weights, so in these graphs n refers to the number of dams. a,b,cDifferences with gestational age; **P < 0.001, strain differences.
