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. 2012 Oct 12;7(10):e47179. doi: 10.1371/journal.pone.0047179

Figure 4. Diagram representing the evolutionary histories of Yamagata-lineage influenza B viruses in Taiwan.

Figure 4

The genome compositions of various genotypes are based on the phylogenetic topographies in Fig. 3, and the genotype definitions and representative viruses are described in the legends of Fig. 2 and 3. The gene segments of the viruses are presented in the order of PB1, PB2, PA, HA, NP, NA, M, and NS (from top to bottom). The circulation time period of each genotype is also illustrated. Blue arrows represent possible evolutionary pathways of genotype development. Green arrows represent reassortment between BE98 and existing genotypes. For example, the TW04-II was generated through reassortment between CA00 virus, providing PB2, PA, NP and NS segments and BE98 virus, providing PB1, HA, NA and MP segments. The red arrow indicates the acquisition of segments from YA98 through reassortment. CA00: B/Canada/16188/2000-like viruses; BE98: B/Beijing/76/98-like viruses; YA98: B/Yamanashi/166/98-like viruses.