So gap junctions transverse two membranes of contiguous cells. That simply means the cells are very close in proximity, closely packed to one another, and they connect the cytoplasm of one cell to the cytoplasm of the adjacent cell. And this can be seen in the following diagram. So this entire structure that transverses the membrane of one cell and the membrane of the adjacent cell, and also transverses this into cellular space. This is a single gap junction. So this is the cytoplasm of one cell and this is the cytoplasm of that adjacent cell.