1S4Z:
reference: Structural basis of HP1/PXVXL motif peptide interactions and HP1 localisation to heterochromatin., Thiru A, Nietlispach D, Mott HR, Okuwaki M, Lyon D, Nielsen PR, Hirshberg M, Verreault A, Murzina NV, Laue ED, EMBO J 2004 Feb 11;23(3):489-99. Epub 2004 Feb 5. PMID: 14765118

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