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OBJECTIVE: To determine that anti-Müllerian hormone (AMH) has been shown to inhibits E₂ production in rodents and in luteinized granulosa cells (GC). We determined whether this occurs in human cells most highly expressing AMH (i.e., from small antral follicles) and whether this is an effect on aromatase promoter activity. We also investigated the effects of AMH on other factors determining FSH sensitivity. DESIGN: Granulosa cells were exposed to AMH with and without gonadotropins for 48 hours. SETTING: University laboratory. PATIENT(S): Not applicable. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Aromatase and FSH receptor messenger RNA expression measured using real time quantitative polymerase chain reaction (PCR). Aromatase promoter II activity measured using a luciferase assay. Estradiol, inhibin A and B, and vascular endothelial growth factor production were measured in the …