FSHR, or Follicle-Stimulating Hormone Receptor, is a receptor protein primarily found on ovarian granulosa cells in females and Sertoli cells in males. It plays a key role in reproductive function by mediating the effects of follicle-stimulating hormone (FSH), which is secreted by the anterior pituitary gland. FSHR is essential for processes like folliculogenesis—the growth and maturation of ovarian follicles in females—by triggering signaling pathways that promote cell growth and development.