4GUA:
reference: Structural and functional insights into alphavirus polyprotein processing and pathogenesis., Shin G, Yost SA, Miller MT, Elrod EJ, Grakoui A, Marcotrigiano J, Proc Natl Acad Sci U S A. 2012 Oct 9;109(41):16534-9. doi:, 10.1073/pnas.1210418109. Epub 2012 Sep 25. PMID: 23010928

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