Western blot of connexin35/36 fusion proteins showing specific immunolabeling of the ~35 kDa connexin-35/36 phosphorylated at Ser276. The first lane (1) is PKA phosphorylated protein purified from the C-Terminal domain. The second lane (2) shows phosphospecificity indicated by no labeling in protein without PKA stimulation. The third lane (3) is protein purified from the intracellular loop, demonstrating that there is no cross-reactivity with the other major PKA phosphorylation site at Ser110.