3LRR:
reference: The structural basis of 5' triphosphate double-stranded RNA recognition by RIG-I C-terminal domain., Lu C, Xu H, Ranjith-Kumar CT, Brooks MT, Hou TY, Hu F, Herr AB, Strong RK, Kao CC, Li P, Structure. 2010 Aug 11;18(8):1032-43. Epub 2010 Jul 15. PMID: 20637642

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