1GUW:
reference: Structure of the HP1 chromodomain bound to histone H3 methylated at lysine 9., Nielsen PR, Nietlispach D, Mott HR, Callaghan J, Bannister A, Kouzarides T, Murzin AG, Murzina NV, Laue ED, Nature 2002 Mar 7;416(6876):103-7. PMID: 11882902

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