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Varying activation patterns identified in phase movies from the left atrium of the sheep heart. A. Sequential snapshots show a rotor pivoting around a phase singularity (point where all phases converge). B. Breakthrough activation pattern. The wave appears on the center of the field of view and propagates outward. Right: key for the different phases of the action potential is color-coded (reproduced from Filgueiras-Rama et al.24)
