1EVL:
reference: Zinc ion mediated amino acid discrimination by threonyl-tRNA synthetase., Sankaranarayanan R, Dock-Bregeon AC, Rees B, Bovee M, Caillet J, Romby P, Francklyn CS, Moras D, Nat Struct Biol 2000 Jun;7(6):461-5. PMID: 10881191

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