4Z0C:
reference: Structural basis for specific recognition of single-stranded RNA by Toll-like receptor 13., Song W, Wang J, Han Z, Zhang Y, Zhang H, Wang W, Chang J, Xia B, Fan S, Zhang D, Wang J, Wang HW, Chai J, Nat Struct Mol Biol. 2015 Oct;22(10):782-787. doi: 10.1038/nsmb.3080. Epub 2015, Aug 31. PMID: 26323037

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