Figure 7.

Wrapping probabilities for M = N (r = 1). (a) For q₁ ≳ p₁, the probability P_M that the virus reaches the fully wrapped state is plotted as a function of the dimensionless fusion-rate parameter rk_fM/p₁. When this parameter is small, P_M approaches unity, but when rk_fM/p₁ ≫ 1, P_M is small. (b) When 1/N ≪ q₁/p₁ ≪ 1, the wrapping probability P_M is plotted as a function of the dimensionless expression (rk_fM/p₁)(q₁/p₁). In this case, the transition of P_M from large to small values occurs at (rk_fM/p₁)(q₁/p₁) ∼ O(1). In both plots, only one parameter was varied within a group of symbols of the same color and shape. In a, the number of spikes M was varied within the groups of circles, and the fusion rate, k_f was varied within the groups of triangles. In b, the number of spikes M was varied within the groups of solid circles, the fusion rate k_f was varied within the groups of open circles, and the coreceptor binding rate q₁ was varied within the groups of triangles.