Acidophils

ACTH-producing cells

Somatotrophs (somatotropin)

Melanotropin (melanocyte-stimulating hormone) producing cells

Lactotrophs (prolactin)

Nonsecretory follicular cells

Basophils

Undifferentiated stem cells

Gonadotrophs (follicle-stimulating hormone, luteinizing hormone)

Thyrotrophs (thyroid-stimulating hormone)