Testicular sertoli cells function in all of the following ways except that they do not:
a. secrete mullerian inhibiting factor
b. secrete progesterone binding protein
c. coordinate spermiogenesis
d. support meiosis
e. serve as the blood-testes barrier

b. secrete progesterone binding protein  

Explanation:

Sertoli cells regulate spermatogenesis and perform various functions in sperm production. Sertoli cells have the function of controlling the maturation and migration of germ cells; are involved in protein and steroid synthesis; phagocyte degenerating germ cells as well as residual cytoplasmic bodies left by adult spermatids in spermatogenesis; form the blood-testicular barrier. Sertoli cells secrete the antimüllerian hormone (antimüllerian hormone - AMH), a glycoprotein from the growth factor family, which suppresses the development of the Müller ducts, precursors of the female reproductive tract. Among the various substances produced by Sertoli cells, the protein binding to androgen-binding protein (ABP), the activin and inhibin.

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