3SDY:
reference: A Highly Conserved Neutralizing Epitope on Group 2 Influenza A Viruses., Ekiert DC, Friesen RH, Bhabha G, Kwaks T, Jongeneelen M, Yu W, Ophorst C, Cox F, Korse HJ, Brandenburg B, Vogels R, Brakenhoff JP, Kompier R, Koldijk MH, Cornelissen LA, Poon LL, Peiris M, Koudstaal W, Wilson IA, Goudsmit J, Science. 2011 Jul 7. PMID: 21737702

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