1S4Y: Crystal Structure Of The Activinactriib Extracellular Domai
reference: A flexible activin explains the membrane-dependent cooperative assembly of tgf-Beta family receptors., Greenwald J, Vega ME, Allendorph GP, Fischer WH, Vale W, Choe S, Mol Cell 2004 Aug 13;15(3):485-9. PMID: 15304227

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