GJA1 and neoplasm: Upregulation of Cx43 in tumor cell-endothelial cell contact areas in one of the larger vessels is shown using DIC (Figure 2e), Cx43 signal (white, Figure 2f), overlay of DIC and Cx43 signal (Figure 2g) and overlay of GFP (tumor cells, green), DAPI (nuclei, blue), and Cx43 (red, yellow arrows) signals (Figure 2h).