Movie S3.

Fly-around of the 3D probability distribution of the side chain N12 atoms around the α-helical backbone. Histograms were compiled over the simulation trajectory using a grid comprising cubic cells of size 0.1 × 0.1 × 0.1 nm, and the probability density function computed by normalizing by the total count and the cell volume. The value of the probability density in any one cell ranged from 0 to 3.7 nm−3. Four contours in the probability density are plotted at 0.05, 0.1, 0.2, and 0.3 nm−3. Because the positive charge in the cationic side chains resides primarily in the termini, this distribution may be considered a proxy for that of the positive charge. This movie was produced using MATLAB (15).