1RSV:
reference: Restoring proper radical generation by azide binding to the iron site of the E238A mutant R2 protein of ribonucleotide reductase from Escherichia coli., Assarsson M, Andersson ME, Hogbom M, Persson BO, Sahlin M, Barra AL, Sjoberg BM, Nordlund P, Graslund A, J Biol Chem 2001 Jul 20;276(29):26852-9. Epub 2001 Apr 27. PMID: 11328804

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