Effects of developmental hypoxia on citrate synthase activity and lipid peroxidation in fetal ventricles. Citrate synthase activity and MDA were measured in homogenized ventricular tissue from male (A, B) and female (C, D) fetuses. Circular symbols show males, triangular symbols show females. For MDA (males), n = 8 (NC from 6 litters), 6 (NM from 6 litters), 5 (HC from 4 litters), 7 (HM from 6 litters). For MDA (females), n = 3 (NC from 3 litters), 6 (NM from 5 litters), 7 (HC from 6 litters), 7 (HM from 6 litters). For citrate synthase (males), n = 10 (NC from 7 litters), 14 (NM from 7 litters), 11 (HC from 6 litters), 9 (HM from 6 litters). For citrate synthase (females), n = 8 (NC from 6 litters), 3 (NM from 3 litters), 8 (HC from 6 litters), 9 (HM from 7 litters). Significance was assessed using a linear mixed model (nested). Error bars show mean ± SEM. HC, hypoxia control; HM, hypoxia melatonin; MDA, malondialdehyde; NC, normoxia control; NM, normoxia melatonin; OD, optical density.