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. Author manuscript; available in PMC: 2010 Nov 3.
Published in final edited form as: FEBS Lett. 2009 Oct 7;583(21):3388–3396. doi: 10.1016/j.febslet.2009.10.001

Fig. 1.

Fig. 1

Topologies of some simple positive-feedback loops. (a) X activating an X-activating factor Y. (b) X activating Y activating an X-activating factor Z. (c) A double-negative (positive) feedback loop, where X inhibits an X-inhibiting factor Y.