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Inhibins and activins are dimeric glycoproteins, member of the transforming growth factor β (TGF β) superfamily. The main source and targets of inhibins during the fertile age, in non pregnant women, are the ovaries, while during pregnancy placental production becomes predominant. Activin is produced from several organs: brain, ovary, uterus, placenta and spleen. During the menstrual cycles, inhibin...