1YTK:
reference: Crystal structure of a nicotinate phosphoribosyltransferase from Thermoplasma acidophilum., Shin DH, Oganesyan N, Jancarik J, Yokota H, Kim R, Kim SH, J Biol Chem 2005 May 6;280(18):18326-35. Epub 2005 Mar 6. PMID: 15753098

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