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Rotigaptide (ZP-123) is a stable gap junction conduction-enhancing antiarrhythmic peptide analogue that has been shown to increase gap junction intercellular conductance in cardiac myocytes. [1] Gap junctions are protein channels that are responsible for conducting electrical impulses between cells in the heart to maintain normal rhythm. It is currently under clinical investigation for the treatment of cardiac arrhythmias – specifically, atrial fibrillation. Gap junction modulation is a promising and novel mechanism of action for the treatment of cardiovascular disorders. [1]