Abstract

Pigment epithelial cells of the frog retina were studied using the freeze-fracture technique. The fractured faces of phagosomes, lipid droplets, myeloid bodies, and other membrane structures were observed. The most characteristic profile of fractured new phagosomes was characterized by lamellated membranes with few intramembrane particles. Lipid droplets had smooth fractured faces with some ripple marks. Myeloid bodies showed ordinary P-, and E-faces, peripheral portions of which were continuous with smooth endoplasmic reticulum. The absence of intramembrane particles in new phagosomes indicated that they disappeared or were digested at an early stage of the degradation of disc membranes. Fracture faces of lipid droplets suggested that they contained little phospholipid components.

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