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Mouse Vm and Cai recordings from RH 237 and GCaMP2. A heart from a mouse that was genetically encoded with GCaMP2 was isolated, perfused in a Langendorff apparatus, and stained with RH 237. APs were recorded from RH 237 (λex = 540 nm and λem > 630 nm) and Cai from GCaMP2 (λex = 480 ± 15 nm and λem =520 ± 150 nm).
