quantitative radioautography at the electron microscopic level revealed endocytosis of hormone and localization to zymogen granules and , to a lesser extent , multivesicular bodies , lysosomes , structures that were receptosome like , and small undefined structures of about 50-100 nm in diameter found dispersed among endoplasmic reticulum saccules .
C0230825
multivesicular bodies
C0034850
receptosome