2L5S: Solution Structure Of The Extracellular Domain Of The Tgf-Be Receptor
reference: The TbetaR-I pre-helix extension is structurally ordered in the unbound form and its flanking prolines are essential for binding., Zuniga JE, Ilangovan U, Mahlawat P, Hinck CS, Huang T, Groppe JC, McEwen DG, Hinck AP, J Mol Biol. 2011 Sep 30;412(4):601-18. Epub 2011 Jul 29. PMID: 21821041

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