2KZ1:
reference: Intermolecular interactions in a 44 kDa interferon-receptor complex detected by asymmetric reverse-protonation and two-dimensional NOESY., Nudelman I, Akabayov SR, Schnur E, Biron Z, Levy R, Xu Y, Yang D, Anglister J, Biochemistry. 2010 Jun 29;49(25):5117-33. PMID: 20496919

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