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The relationship between individual placental and fetal weights at E16 (y = 0.98x + 0.29, r = 0.331, n = 283 fetuses from 36 litters, P < 0.0001) and E19 (y = −0.07x + 1.15, r =−0.009, n = 260 fetuses from 36 litters, P > 0.05).