Fig. 4. Dye transfer efficiencies of Cx43 variants (A), dominant-negative (B) and trans-dominant-negative dye transfer inhibition (C) of co-expressed Cx43 and Cx32, respectively. Cells that transferred dye to neighboring cells were counted, and the percentage of cells transferring dye are shown as bars. Injections at low (black bars) and high (gray bars) wild-type Cx43 or wt Cx32 expression levels are shown in B and C. Total numbers of injected cells are given in parentheses under the names of the expressed proteins.