the effects of a sudden but sustained exposure to cold ( 1 to 6c ) on serum tsh , thyroxine ( t4 ) and triiodothyronine ( t3 ) ( all measured by radioimmunoassay ) , pituitary tsh concentration , pituitary tsh secretory responsiveness to hypothalamic extract or synthetic thyrotropin-releasing hormone ( trh ) in vitro as well as in vivo , and the changes of the thyrotropin-releasing activity in three trf-rich hypothalamic areas were determined .
C0032002
pituitary
C0040162
trf