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Substitution of Ca2+ with 5 mm Co2+ completely blocked changes in Ca fluorescence (ΔF), hyperpolarization-induced Ca2+plateaus, and inhibitory synaptic transmission between heart interneurons. Simultaneous recordings of electrical activity (Vm) and changes in Ca fluorescence (ΔF) in a pair of oscillator interneurons at the sites indicated by numbers on the inset. Changes in Ca fluorescence (ΔF) recorded at 4–7 Hz.
