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Plasma levels (ng/ml) of estrogens (open columns) and DHEA (solid columns) in maternal and fetal blood vessels in four mares carrying a female or male fetus. A, artery; V, vein; J, jugular; U, uterine; Um, umbilical; O, ovary; T, testis; L, left; R, right. (Raeside et al. 1979 [47]).
