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The crystal and cryo-electron microscope structures of homologous connexin GJs showed that the NT domain lines the GJ pore, a position that could serve a role in Vj-sensing and gating. We hypothesize that the residues in the NT domain of Cx45 are important for its Vj-gating properties. Protein sequence alignment of human Cx45 NT domain with the connexins in the α and β groups revealed that the second and the eighth residues in Cx45 are different from most of these connexins. We generated a total of 14 variants on these two residues and stud