Computed versus experimental mean interhelical angles between H1 and H3, H2 and H3, and H3 and H4 for two apo NMR cases (PDB: 2L0P (blue) (26), 2LLU (cyan) (28)), and the half-saturated state (green). On average, the H1/H3 and H3/H4 angles in the half-saturated state are inconsistent with those in the apo state. To see this figure in color, go online.