Model in which protein increases the association rate of protein . and from bottom to top curve.

<p>A) . Solid lines are for protein , the dotted line is for protein , and the dashed lines are used for estimating the order of magnitude of the rate constants from the curves, giving for the steepest curve, and and for the slowest curve. Depending on the parameters the curves show an increasing slope at the beginning. B) same parameters as in A) except . The curves always show an increasing slope at the beginning, which helps distinguishing this case from the one shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0066590#pone-0066590-g002" target="_blank">Figure 2A</a>. Additionally, for large values of the recruitment curves of resemble the recruitment curve of , which is not the case if .