the concentration of human beta-endorphin ( beta h-ep ) ) was measured in various hypothalamic nuclei , in extrahypothalamic brain regions and in the anterior and posterior lobes of the pituitary using a specific radioimmunoassay ( ria ) the beta h-ep concentrations in the arcuate nucleus ( 169 +/- 35 pg/100 micrograms protein , n = 7 ) and median eminence ( 163 +/- 32 pg/100 micrograms protein , n = 6 ) were among the highest in the 17 brain areas examined .
C0086045
concentrations
C0006104
brain