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. 2013 Dec 5;4:426. doi: 10.3389/fimmu.2013.00426

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Copyright © 2013 Alagha and Zaikin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Subcritical pitchfork bifurcation diagrams for symmetric scenario. Bifurcation diagrams (A–D) and nullclines at the beginning (E) and end (F) of the bifurcation diagram (D). For all n = 4. For (A) a = 1, b = 1, r = 0.5, (B) b = 1, k = 1, r = 0.5, (C) a = 1, b = 1, k = 1, (D–F) a₁ = a₂ = 1, k₁ = k₂ = 1.5. In (C) there is also supercritical pitchfork bifurcation.