Figure 2.

Dynamics of colocalization in a two-polymer system. The normalized polymer mean-squared distance, d²(t), is plotted as function of time t at a fixed binding energy E = 3.4 kT, for the two shown values of the molecule concentration, c, above and below threshold. The polymers are initially positioned at a given distance. At the lower concentration (c = 0.1%, circles), the polymers do not colocalize and attain the average distance of two randomly located polymers. When the concentration is raised to c = 1.0% (triangles), the colocalization transition occurs (see Fig. 1) and the polymers pair off at equilibrium, as shown by d²(t), which eventually collapses to zero. The cases shown concern Model A, but similar behaviors are found with Model B.