3UP1: Crystal Structure Of The Unliganded Human Interleukin-7 Rece Extracellular Domain
reference: Structural reorganization of the interleukin-7 signaling complex., McElroy CA, Holland PJ, Zhao P, Lim JM, Wells L, Eisenstein E, Walsh ST, Proc Natl Acad Sci U S A. 2012 Feb 14;109(7):2503-8. Epub 2012 Jan 30. PMID: 22308406

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