Abstract
The effect of breast milk and 3α, 20β-pregnanediol on the conjugation of bilirubin and o-aminophenol by rat liver was compared. Breast milk inhibited glucuronyl transferase, whereas 3α, 20β-pregnanediol inhibited the secretion of bilirubin glucuronide from rat liver slices. In the inhibitory breast milk examined the steroid was probably not the sole inhibitory factor.
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