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Ataxia telangiectasia mutated kinase (ATM) is involved in cell cycle checkpoints, DNA repair and apoptosis. β‐Adrenergic receptor (β‐AR) stimulation induces cardiac myocyte apoptosis. Here we analysed basal myocardial structure and function in ATM knockout (KO) mice and tested the hypothesis that ATM modulates β‐AR‐stimulated myocyte apoptosis. Left ventricular (LV) structure and function, myocyte...