1FLC:
reference: Structure of the haemagglutinin-esterase-fusion glycoprotein of influenza C virus., Rosenthal PB, Zhang X, Formanowski F, Fitz W, Wong CH, Meier-Ewert H, Skehel JJ, Wiley DC, Nature 1998 Nov 5;396(6706):92-6. PMID: 9817207

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