Fig. 5. Immunocytochemical localization of the V-type H⁺-ATPase (A–D and G–I) and Na⁺/K⁺-ATPase (E,F). (A,C,E,G) Phase contrast and (B,D,F,H,I) fluorescence micrographs of 0.7 µm thick cryosections of the anterior sternal epithelium. (A,B) Control stage. (C–F) Stage of CaCO₃ deposit formation. (G–I) Stage of CaCO₃ deposit resorption. (I) Staining without amplification step. bc, blood cell; bl, basal lamina; cl, cuticle; n, nucleus. Scale bars, 25 µm (A–H); 16 µm (I).