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CK59 is calcium-calmodulin-dependent kinase II (CaMKII) inhibitor. CK59 inhibits multiple voltage-gated calcium channels, including the L-type channel during depolarization in a dose-dependent manner. The IC50 for CK59 was approximately 50 μM, which is only fivefold larger than the reported IC50 values for CaMKII inhibition. The inhibition due to CK59 was reversible; washout of the drug brought calcium levels back to control values upon depolarization.