1W5R:
reference: Investigation of the catalytic triad of arylamine N-acetyltransferases: essential residues required for acetyl transfer to arylamines., Sandy J, Mushtaq A, Holton SJ, Schartau P, Noble ME, Sim E, Biochem J. 2005 Aug 15;390(Pt 1):115-23. PMID: 15869465

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