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Fig. 2. ATP-s but not ATP-i cells are dye coupled. ATP-s (A,B) and ATP-i (C,D) cells were injected with Lucifer Yellow and observed under phase-contrast (A,C) and fluorescence (B,D) microscopy. In ATP-s cells (B), dye spreads to at least three adjacent cells, whereas, in ATP-i cells (D), dye remained restricted to the injected cells. Arrow and asterisk indicate the injected cells. Bar, 50 µm.