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The external aldimine crystal structure of salmonella typhimurium tryptophan synthase mutant beta-s377a with inhibitor 2-({[4-(trifluoromethoxy)phenyl]sulfonyl}amino)ethyl dihydrogen phosphate (f9f) at the alpha-site, cesium ion at the metal coordination site, and (e)-n-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methylidene)-l-serine (kou) at the beta-site
