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Electron-microscopical analysis of human CS ultrastructure. (a) Secretory granules (red arrows); primary lysosomes (yellow arrows). (b) Intercellular contacts (blue arrows). (c) Intracellular, unorganized thick filaments (green arrows); dense bodies (asterisks). (d) Mitosis (N, nucleus; G, Golgi apparatus; rER, rough endoplasmic reticulum).
