Fig. S7.

(A) PMFs for pairs of R10 molecules as a function of the separation between the centers of mass ($c.o.m.-c.o.m.$) at $c_s=0.07$ M. PMFs are calculated using the A99 (blue line) and A03 (red line) force fields. (B) PMFs for pairs of R10 molecules as a function of the separation between the guanidino-C atoms of the ninth residues ($CZ9-CZ9$) calculated from umbrella-sampling MD simulations where the biased coordinate is $CZ9-CZ9$ (blue line) and $CZ10-CZ8$ (red line).