1R53:
reference: Crystal structure of the bifunctional chorismate synthase from Saccharomyces cerevisiae., Quevillon-Cheruel S, Leulliot N, Meyer P, Graille M, Bremang M, Blondeau K, Sorel I, Poupon A, Janin J, van Tilbeurgh H, J Biol Chem 2004 Jan 2;279(1):619-25. Epub 2003 Oct 21. PMID: 14573601

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