3A9U:
reference: Crystal structures of a Populus tomentosa 4-coumarate:CoA ligase shed light on its enzymatic mechanisms., Hu Y, Gai Y, Yin L, Wang X, Feng C, Feng L, Li D, Jiang XN, Wang DC, Plant Cell. 2010 Sep;22(9):3093-104. Epub 2010 Sep 14. PMID: 20841425

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