4HJX:
reference: A Genetically Encoded F NMR Probe for Tyrosine Phosphorylation., Li F, Shi P, Li J, Yang F, Wang T, Zhang W, Gao F, Ding W, Li D, Li J, Xiong Y, Sun J, Gong W, Tian C, Wang J, Angew Chem Int Ed Engl. 2013 Feb 28. doi: 10.1002/anie.201300463. PMID: 23450644

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