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Introduction: Junctophilins(JPs)are membrane-binding proteins within the junctional membrane complexs,which can bind both the plasma membrane and endoplasmic/sarcoplasmic reticulum(ER/SR)membrane.Ryanodine receptor 2(RyR2)is an intracellular Ca2+release channel existing in the SR of mammalian cells.In the present study we documented the interaction of JP2 with RyR2 in the cardiac muscle.