5UY1:
reference: The Cation-pi Interaction Enables a Halo-Tag Fluorogenic Probe for Fast No-Wash Live Cell Imaging and Gel-Free Protein Quantification., Liu Y, Miao K, Dunham NP, Liu H, Fares M, Boal AK, Li X, Zhang X, Biochemistry. 2017 Feb 21. doi: 10.1021/acs.biochem.7b00056. PMID: 28221782

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