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"CALM1 encodes a regulatory protein of RYR2 and is responsible for inhibiting Ca 2+ release from RYR2 in the sarcoplasmic reticulum to maintain a normal contraction‐relaxation cycle. xref Oxidative stress impairs binding of CALM1 to RYR2 , causing aberrant Ca 2+ release, resulting in cardiac hypertrophy and HF in murine and canine models. xref , xref Our results suggest that estradiol treatment led to tighter control of cardiac Ca 2+ physiology and improved diastolic relaxation."