2YN4:
reference: Marine Rhodobacteraceae l-haloacid dehalogenase contains a novel His/Glu dyad that could activate the catalytic water., Novak HR, Sayer C, Isupov MN, Paszkiewicz K, Gotz D, Mearns Spragg A, Littlechild JA, FEBS J. 2013 Apr;280(7):1664-80. doi: 10.1111/febs.12177. Epub 2013 Mar 8. PMID: 23384397

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).