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Fig. 6. Electron micrographs of the anterior sternal epithelium of Porcellio scaber. (A) Overview of chemically fixed epithelial cells during formation of the CaCO3 deposits showing the distribution of the basolateral plasma membrane (bm) by extracellular invaginations. (B,C) Details of high-pressure frozen and freeze-substituted epithelial cells during the resorption of the CaCO3 deposits showing portasome coats (arrows) at the apical plasma membrane. bl, basal lamina; cl, cuticle; m, mitochondrion; n, nucleus. Scale bars, 2 µm (A); 200 nm (B–D).





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