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Figure 2
Crystal structures (100 K) of the three peptide model systems with 50% ADP probability ellipsoids. Hydrogen bonds are shown in green. (a) Gly-Ala (GA), (b) Ala-His-Ala (AHA), (c) cyclo-(Ala)4-(D,L-Pro)2 (A4P2).

IUCrJ
Volume 7| Part 2| March 2020| Pages 158-165
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519015975