1QU1:
reference: N- and C-terminal residues combine in the fusion-pH influenza hemagglutinin HA(2) subunit to form an N cap that terminates the triple-stranded coiled coil., Chen J, Skehel JJ, Wiley DC, Proc Natl Acad Sci U S A 1999 Aug 3;96(16):8967-72. PMID: 10430879

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