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Traveling waves connecting the state of MAPK activation and the state of MAPK inactivity can move toward or away from the wound depending on ROS concentration at cell layer level (s̄) and activation threshold (cA) when n → ∞. The thick black line indicates conditions under which the front is not moving. Regimes above the line lead to traveling waves moving toward the wound, while those below the line lead to fronts moving away from the wound.
