Tracer transfer in HeLa wild-type (a, d, g), HeLa–Cx47 (b, e, h), and HeLa–Cx47-EGFP (c, f, i) cells. The cells were injected with Lucifer yellow (a–c), DAPI (d–f), or neurobiotin (g–i). Microphotographs were taken with the appropriate filter set or after fixing and staining in the case of neurobiotin. The injected cells are marked withasterisks. Scale bar: a–g, 50 μm;h, i, 100 μm.