although authentic trh constituted only 37 % of total trh-ir in pituitary stalk blood , the amount released during the first hour into stalk blood ( 1.7 ng ) in relation to hypothalamic content ( approximately 5 ng ) was still high ( approximately 34 % ) compared with that of lhrh ( approximately 0.6 % ) and somatostatin ( approximately 0.3 % ) .
C0020663
hypothalamic
C0023610
lhrh