4AZK:
reference: Structural basis of L-phosphoserine binding to Bacillus alcalophilus phosphoserine aminotransferase., Battula P, Dubnovitsky AP, Papageorgiou AC, Acta Crystallogr D Biol Crystallogr. 2013 May;69(Pt 5):804-11. doi:, 10.1107/S0907444913002096. Epub 2013 Apr 11. PMID: 23633589

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