3QB7:
reference: Redirecting cell-type specific cytokine responses with engineered interleukin-4 superkines., Junttila IS, Creusot RJ, Moraga I, Bates DL, Wong MT, Alonso MN, Suhoski MM, Lupardus P, Meier-Schellersheim M, Engleman EG, Utz PJ, Fathman CG, Paul WE, Garcia KC, Nat Chem Biol. 2012 Oct 28. doi: 10.1038/nchembio.1096. PMID: 23103943

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