6ASZ:
reference: Investigation of Trimethyllysine Binding by the HP1 Chromodomain via Unnatural Amino Acid Mutagenesis., Baril SA, Koenig AL, Krone MW, Albanese KI, He CQ, Lee GY, Houk KN, Waters ML, Brustad EM, J Am Chem Soc. 2017 Nov 20. doi: 10.1021/jacs.7b09223. PMID: 29111699

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