4NKQ:
reference: The structure of the GM-CSF receptor complex reveals a distinct mode of cytokine receptor activation., Hansen G, Hercus TR, McClure BJ, Stomski FC, Dottore M, Powell J, Ramshaw H, Woodcock JM, Xu Y, Guthridge M, McKinstry WJ, Lopez AF, Parker MW, Cell. 2008 Aug 8;134(3):496-507. PMID: 18692472

This OCA Structure page
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