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. 2012 Aug 8;7(8):e41806. doi: 10.1371/journal.pone.0041806

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© 2012 Drion et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The - and -nullclines are drawn as full and dashed lines, respectively, and the hyperpolarized state as a filled circle . The trajectories are drawn as red oriented lines. In high calcium conductance mode, the phase portrait shows two -nullclines branches which derives from a transcritical singularity.

Inline graphic — The - and -nullclines are drawn as full and dashed lines, respectively, and the hyperpolarized state as a filled circle . The trajectories are drawn as red oriented lines. In high calcium conductance mode, the phase portrait shows two -nullclines branches which derives from a transcritical singularity.