Figure 2.

(A) Distribution of interhelical packing angles (Ω). Interhelical packing angles were calculated as the angle between the local helical axes at the point of minimal axial distance. L-H, left-handed; R-H, right-handed; blue, all helix–helix interactions; red, helix–helix interactions with at least two Cα—H⋅⋅⋅O contacts to backbone or side-chain oxygen atoms; yellow, helix–helix interactions with at least two backbone-to-backbone Cα—H⋅⋅⋅O⩵C contacts. (B) Distribution of interhelical axial distances among the same three categories as for A.