Fig 4.
Regular model structures with the chain direction (helix axis) along the fiber yield sharply peaked distributions for (αF, βF). (A) The expected center of the distributions for various common conformations. More details are given in Materials and Methods. B shows the regions of torsion angles that are compatible with a regular structure along the fiber direction and (αF, βF) = (10°, 70°). Contour levels are set 10, 20, and 30° maximum absolute difference. Darker color indicates smaller values for the deviation. (C) A right-handed β spiral structure is expected to show a broad range of angles (αF, βF).