... of the lineages and sublineagesClassification and designation of the lineages and sublin-eages within type A influenza virus are essential for the studies of the viral evolution, ecology and ... have been classified into somelineages and sublineages, such as the North American lin-eage, the gull lineage, the human-like swine lineage, etc[4-9]. In the past century, type A influenza ... manuscript.Additional materialAdditional file 1 The designations and alignment of the representative sequences of PB2 gene. The data could be read out with NotePad and the Mega soft-ware, and gaps are...