cardiovascular system
• peak calcium transient amplitude and sarcoplasmic reticulum calcium load is increased compared to in wild-type myocytes
• pacing-introduced calcium transient decay rates is enhanced compared to in wild-type myocytes
• higher baseline measurements of contractility
• reduced beta-adrenergic stimulation response by isoproterenol
• however, the decay rate of caffeine-induced calcium transients is normal
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