Fig. 1
From: Characterization of emerging Newcastle disease virus isolates in China
Phylogenetic tree of the nucleotide sequence of NDV strains based on a variable portion (nt 1–389) of the F gene. The accession numbers of the sequences derived in this study and those derived from GenBank were shown in Table 1. The tree was constructed using MEGA 4 neighbor-joining method with 1000 replicates of bootstrap. Genotype, sub-genotype and recently Chinese isolates are indicated on the right. ▲: Shaanxi NDV isolates