5VK7:
reference: Direct visualization of critical hydrogen atoms in a pyridoxal 5'-phosphate enzyme., Dajnowicz S, Johnston RC, Parks JM, Blakeley MP, Keen DA, Weiss KL, Gerlits O, Kovalevsky A, Mueser TC, Nat Commun. 2017 Oct 16;8(1):955. doi: 10.1038/s41467-017-01060-y. PMID: 29038582

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