Figure 3.

Examples of hydrogen positions that were manually-placed to the 2F₀-F_celectron-density of a hydrogen-bond (at the 0σ contour level). (A) Ser-A205 [2AWK] with a hydrogen bond to a Glu. (B) Thr-A30 [1LS1] with a hydrogen bond to a backbone carbonyl O atom. (C) Tyr-149 [1CEX] with a hydrogen bond to water.