FIGURE 3.

Spontaneous nucleation of actin filaments, and nucleation by CP. CP concentration increases from bottom to top: 0 nM, 2 nM, 5 nM, 7 nM, 10 nM, 15 nM, and 25 nM. Smooth curves, Model II (bottom curve, multiplied by a factor of 2 for visibility) and Model III (remaining curves).