3RJ1:
reference: Architecture of the Mediator head module., Imasaki T, Calero G, Cai G, Tsai KL, Yamada K, Cardelli F, Erdjument-Bromage H, Tempst P, Berger I, Kornberg GL, Asturias FJ, Kornberg RD, Takagi Y, Nature. 2011 Jul 3;475(7355):240-3. doi: 10.1038/nature10162. PMID: 21725323

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