Positive feedback is a mechanism by which an output is enhanced, such as protein levels. however, in order to avoid any fluctuation in the protein level, the mechanism is inhibited stochastically (I), therefore when the concentration of the activated protein (A) is past the threshold ([I]), the loop mechanism is activated and the concentration of A increases exponentially if d[A]=k [A]
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[[Image:Positive feedbakc bistable switch.svg|thumb|250px|Positive feedback is a mechanism by which an output is enhanced, such as protein levels. however, in order to avoid any fluctuation in the protein level, the mechanism is inhibited stochastically (