PAS-related domain (PRD) repeats mediate phytochrome dimerization. 

The PRD domain targets the Pfr form of phyB to the nucleus, although it lacks a canonical nuclear localization signal (NLS).

TLS Online TPP Program

#Id: 6585

#Unit 7. System Physiology – Animal

The membranes of late spermatids and spermatozoa contain a special small form of angiotensin converting enzyme called germinal angiotensin converting enzyme (gACE)

TLS Online TPP Program

#Id: 6586

#Unit 7. System Physiology – Animal

Hormonal factors that stimulate spermatogenesis:

Testosterone

Luteinizing hormone

Follicle-stimulating hormone

Estrogens

Growth hormone

TLS Online TPP Program

#Id: 6587

#Unit 7. System Physiology – Animal

Testosterone, secreted by the Leydig cells located in the interstitium of the testis, is essential for growth and division of the testicular germinal cells.

TLS Online TPP Program

#Id: 6588

#Unit 7. System Physiology – Animal

Luteinizing hormone, secreted by the anterior pituitary gland, stimulates the Leydig cells to secrete testosterone

TLS Online TPP Program

#Id: 6589

#Unit 7. System Physiology – Animal

Follicle-stimulating hormone, secreted by the anterior pituitary gland, stimulates the Sertoli cells; stimulates, the process of spermiogenesis

TLS Online TPP Program

#Id: 6590

#Unit 7. System Physiology – Animal

Follicle-stimulating hormone, secreted by the anterior pituitary gland, stimulates the Sertoli cells; stimulates, the process of spermiogenesis