2ZE7:
reference: Structural insight into the reaction mechanism and evolution of cytokinin biosynthesis., Sugawara H, Ueda N, Kojima M, Makita N, Yamaya T, Sakakibara H, Proc Natl Acad Sci U S A. 2008 Feb 19;105(7):2734-9. Epub 2008 Feb 7. PMID: 18258747

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