2GWU:
reference: NMR-based model reveals the structural determinants of mammalian arylamine N-acetyltransferase substrate specificity., Zhang N, Liu L, Liu F, Wagner CR, Hanna PE, Walters KJ, J Mol Biol. 2006 Oct 13;363(1):188-200. Epub 2006 Aug 15. PMID: 16959263

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