2FY4:
reference: Substrate binding and catalytic mechanism of human choline acetyltransferase(,)., Kim AR, Rylett RJ, Shilton BH, Biochemistry. 2006 Dec 12;45(49):14621-31. PMID: 17144655

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