Fig. 1From: Hemagglutinin stalk-based monoclonal antibody elicits broadly reactivity against group 1 influenza A virusThe phylogenetic tree of the H1-H18 HA sequences tested in this study. The phylogenetic tree was made by the neighbor-joining method. Group 1 subtypes were shown in orange and group 2 subtypes in purple. They stood for the short name of the strainsBack to article page