pituitary glands of grassfrog ( rana pipiens ) , bullfrog ( rana catesbeiana ) , clawed toad ( xenopus laevis ) and two species of terrapin ( chrysemys picta and pseudemys scripta ) were incubated in medium containing hypothalamic extract ( he ) , thyrotrophin releasing hormone ( trh ) , somatostatin , dopamine , or combinations of these treatments .
C0020663
hypothalamic
C0037659
somatostatin