5XK7:
reference: "Head-to-Middle" and "Head-to-Tail" cis-Prenyl Transferases: Structure of Isosesquilavandulyl Diphosphate Synthase., Gao J, Ko TP, Chen L, Malwal SR, Zhang J, Hu X, Qu F, Liu W, Huang JW, Cheng YS, Chen CC, Yang Y, Zhang Y, Oldfield E, Guo RT, Angew Chem Int Ed Engl. 2018 Jan 15;57(3):683-687. doi: 10.1002/anie.201710185., Epub 2017 Dec 21. PMID: 29215779

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