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RNA secondary structures predicted in two regions of the NS segment suspected to be lineage-specific regions. Only strains showing nucleotide substitutions compared to reference strain A/California/04/2009 are presented. Strains A/Sw/France/12-160129/2016 and A/Sw/France/01-150203/2015 were used to represent the predicted RNA secondary structures of strains belonging to the SeL and SwD genogroups, respectively. Nucleotide substitutions are indicated by blue arrows.
