Table 1.

Fetal biometric measures at E18.5 in WT and eNOS^-/- mice.

	WT vehicle	WT melatonin	eNOS-/- vehicle	eNOS-/- melatonin
Crown:rump length (mm)	28.2 ± 0.5	28.4 ± 0.5	26.6 ± 0.7a,b	26.6 ± 0.6a,b
Abdominal circumference (mm)	25.8 ± 0.3	26.0 ± 0.3	24.0 ± 0.5a,b	23.9 ± 0.3a,b
Head circumference (mm)	25.0 ± 0.2	24.7 ± 0.3	24.4 ± 0.4a,b	24.2 ± 0.3a,b

Number of litters as follows; WT vehicle N = 18, WT melatonin N = 20, eNOS^-/- vehicle N = 13, eNOS^-/- melatonin N = 17. ^aP < 0.001 compared with WT vehicle, ^bP < 0.001 compared with WT melatonin, generalized linear mixed models with sequential Sidak post-test.