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(A) Representative images of ArcLight-CMs with maximum diastolic potential (MDP) or AP peak show reduction of ArcLight fluorescence intensity with depolarization. Scale bar, 50 μm. (B) Traces recorded from a typical pacemaker-like APs (left) and averaged AP profile from the traces (right). (C) Traces recorded from a typical working CM-like APs (left) and averaged AP profile from the traces (right).
