1ADY:
reference: Crystal structure analysis of the activation of histidine by Thermus thermophilus histidyl-tRNA synthetase., Aberg A, Yaremchuk A, Tukalo M, Rasmussen B, Cusack S, Biochemistry 1997 Mar 18;36(11):3084-94. PMID: 9115984

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