4YYH:
reference: A Subset of Human Bromodomains Recognizes Butyryllysine and Crotonyllysine Histone Peptide Modifications., Flynn EM, Huang OW, Poy F, Oppikofer M, Bellon SF, Tang Y, Cochran AG, Structure. 2015 Sep 4. pii: S0969-2126(15)00329-9. doi:, 10.1016/j.str.2015.08.004. PMID: 26365797

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