although the adrenal medulla contains high concentrations of [ met ] enkephalin-containing polypeptides which are costored with catecholamines , and although the adrenal gland appears to secrete [ met ] enkephalin into the adrenal vein , the relative adrenal contribution to plasma [ met ] enkephalin appears to be negligible .
C0001629
adrenal medulla
C0001625
adrenal gland