1KHX: Crystal Structure Of A Phosphorylated Smad2
reference: Crystal structure of a phosphorylated Smad2. Recognition of phosphoserine by the MH2 domain and insights on Smad function in TGF-beta signaling., Wu JW, Hu M, Chai J, Seoane J, Huse M, Li C, Rigotti DJ, Kyin S, Muir TW, Fairman R, Massague J, Shi Y, Mol Cell 2001 Dec;8(6):1277-89. PMID: 11779503

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