11. Activin ? A and ? B are identical to the two beta subunits of inhibin . 12. Adding a new test for the hormone inhibin A increases reliability to up to 75 percent. 13. The inhibin beta A subunit joins the alpha subunit to form a pituitary FSH secretion inhibitor. 14. The inhibin beta B subunit joins the ? subunit to form a pituitary FSH secretion inhibitor. 15. These results suggest that inhibin has been considered as a regulator of Leydig cell differentiated function. 16. Conversely, "'inhibin "'downregulates FSH synthesis and inhibits FSH secretion. 17. Below is a list of the most common inhibin and activin complexes and their subunit composition: 18. Immunohistochemical markers of Leydig cell tumours include inhibin -alpha, calretinin, and melan-A. 19. Similarly, decreased inhibin feedback after hysterectomy is hypothesized to contribute to increased ovarian stimulation and earlier menopause. 20. Inhibin is produced by the spermatogenic cells, which, also through inactivating activin, inhibits the hypothalamus.
