6N3I:
reference: Engineered XylE as a tool for mechanistic investigation and ligand discovery of the glucose transporters GLUTs., Jiang X, Wu J, Ke M, Zhang S, Yuan Y, Lin JY, Yan N, Cell Discov. 2019 Mar 5;5:14. doi: 10.1038/s41421-019-0082-1. eCollection 2019. PMID: 30854221

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