1SYY:
reference: The radical site in chlamydial ribonucleotide reductase defines a new R2 subclass., Hogbom M, Stenmark P, Voevodskaya N, McClarty G, Graslund A, Nordlund P, Science. 2004 Jul 9;305(5681):245-8. PMID: 15247479

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