3J1N:
reference: Interaction of the mediator head module with RNA polymerase II., Cai G, Chaban YL, Imasaki T, Kovacs JA, Calero G, Penczek PA, Takagi Y, Asturias FJ, Structure. 2012 May 9;20(5):899-910. doi: 10.1016/j.str.2012.02.023. PMID: 22579255

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