at 10 , 30 , 60 , and 120 minutes after the onset of stress , their fetuses were dissected out , and the contents of hypothalamic and pituitary immunoreactive beta-endorphin ( ir-beta-ep ) and hypothalamic immunoreactive growth hormone-releasing factor ( ir-grf ) were determined by specific radioimmunoassays .
C0020663
hypothalamic
C0037668
growth hormone-releasing factor