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MWG compared with the number of pups delivered in (A) SW (n = 34), (B) C57BL6 mice (n = 27), and (C) BALB/cJ (n = 31) mice. The earliest day at which the slope of the regression line differed significantly from 0 was day 11 (P = 0.015) for SW mice (except for the pregnancy with only 2 pups, all of the data points are clustered together), day 14 (P = 0.014) for C57BL6 mice, and day 9 (P = 0.037) for BALB/cJ mice.
