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Fig. 6. Spatial distribution of Cx43 in ATP-s and ATP-i cells. Phase-contrast (A,C) and immunofluorescence (B,D) micrographs were taken from ATP-s (A,B) and ATP-i (C,D) cells cultivated on glass cover slips. Notice the Cx43-specific labeling at membrane appositional areas in ATP-s cells (B, arrow). By contrast, labeling is absent from the appositional areas in ATP-i cells and concentrates in the interior of the cells (D, arrow). Bar, 20 µm.