4DQN:
reference: Structure of the branched-chain aminotransferase from Streptococcus mutans., Ruan J, Hu J, Yin A, Wu W, Cong X, Feng X, Li S, Acta Crystallogr D Biol Crystallogr. 2012 Aug;68(Pt 8):996-1002. Epub 2012 Jul, 17. PMID: 22868765

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