... Asn77 of chain B, then Asn77 of chain A isclose to Ala25 of chain B.Chain A Chain B Hydrogen bondsAla25 Asn77, Arg80 AlaO–ArgNH1AlaO–ArgND2Asn26 His35, Arg80, Asn39 AsnOD1–ArgNH1AsnOD1–HisNE2Ser28 ... in detail, as it diffracts to a Table 1. Statistics on data collection and refinement. A wavelength of 0.8726 A ˚was used. Rotations of 1° were performed. The Ramachan-dran plot was calculated ... when at least one atom of a residue of chain A is at a dis-tance shorter than 4.0 A ˚from an atom of a residue of chain B.When a hydrogen bond is formed, the two atoms are explicitlymentioned...