1RKV:
reference: The thrH Gene Product of Pseudomonas aeruginosa Is a Dual Activity Enzyme with a Novel Phosphoserine:Homoserine Phosphotransferase Activity., Singh SK, Yang K, Karthikeyan S, Huynh T, Zhang X, Phillips MA, Zhang H, J Biol Chem 2004 Mar 26;279(13):13166-73. Epub 2003 Dec 29. PMID: 14699121

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