3C6R:
reference: Structure of the immature dengue virus at low pH primes proteolytic maturation., Yu IM, Zhang W, Holdaway HA, Li L, Kostyuchenko VA, Chipman PR, Kuhn RJ, Rossmann MG, Chen J, Science. 2008 Mar 28;319(5871):1834-7. PMID: 18369148

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