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Effect of heterogeneities in myofibroblast (Myofib) density on propagation when myofibroblasts displace myocytes. A: propagation of a premature impulse (S1S2 = 198 ms) in a preparation with a myofibroblast density of ∼15%. The propagating impulse does not block. B: block of a premature impulse (S1S2 = 198 ms) at the boundary between an area with myofibroblasts (density 15%) and an area without myofibroblasts.
