1U7V: Crystal Structure Of The Phosphorylated Smad2smad4 Heterotrimeric Complex
reference: Structural basis of heteromeric smad protein assembly in TGF-beta signaling., Chacko BM, Qin BY, Tiwari A, Shi G, Lam S, Hayward LJ, De Caestecker M, Lin K, Mol Cell 2004 Sep 10;15(5):813-23. PMID: 15350224

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