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Figure 9
(a) Interaction of metal-coordinating residues in XI with D+ at pH 5.9 (PDB entry 3qza). (b) Interaction of metal-coordinating residues in XI with D3O+ at pH 7.7 (PDB entry 3kcj) (Kovalevsky et al., 2011BB51).

IUCrJ
Volume 4| Part 1| January 2017| Pages 72-86
ISSN: 2052-2525
https://doi.org/10.1107/S205225251601664X