4M44:
reference: Structural basis for the divergent evolution of influenza B virus hemagglutinin., Ni F, Kondrashkina E, Wang Q, Virology. 2013 Nov;446(1-2):112-22. doi: 10.1016/j.virol.2013.07.035. Epub 2013, Aug 27. PMID: 24074573

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