1MP4:
reference: Expanding pyrimidine diphosphosugar libraries via structure-based nucleotidylyltransferase engineering., Barton WA, Biggins JB, Jiang J, Thorson JS, Nikolov DB, Proc Natl Acad Sci U S A 2002 Oct 15;99(21):13397-402. PMID: 12374866

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