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. 2014 May;143(5):577–604. doi: 10.1085/jgp.201311123

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Figure 2. — The model prediction when couplons were placed at 1.4-µm spacing. (A) Isolated calcium sparks were generated, with no significant propagation. (B) Action potentials produced by the model in A. Beating rate was slow, with no terminal DD as a result of spontaneous calcium release.