All of the following statements regarding Seoli cells are TRUE, EXCEPT:

Seoli cells are stimulated by pituitary FSH surface FSH receptors and by testosterone from the Leydig cells cytoplasmic receptors. The FSH stimulated seoli cells produce androgen binding protein which binds testosterone and is carried into the fluid of the seminiferous tubule where it exes a strong influence on the course of spermatogenesis. The principal functions of Seoli cells are: Maintenance of blood testis barrier Secretion of tubular fluid Secretion of androgen binding protein Secretion of estrogen and inhibin Maintenance and coordination of spermatogenesis Phagocytosis of residual bodies of sperm cells Ref: Human Embryology and Developmental Biology By Bruce M. Carlson page 20.