in brains that received lateral ventricular injections of labeled insulin , the concentration of radioactivity in the periventricular region of the hypothalamus , as revealed by autoradiographic grains , was significantly greater than that in the periventricular region of brains that received lateral ventricular injections of labeled insulin mixed with an equimolar excess of an unlabeled peptide ( insulin , ribonuclease , or both together ) .
C0006104
brains
C0086045
concentration