Fig. 1From: Phylogenetic, antigenic and biological characterization of pigeon paramyxovirus type 1 circulating in ChinaPhylogenetic tree based on full-length nucleotide sequences of NDV strains. The tree of 41 nucleotide sequences was constructed using MEGA7 [33]. Strain genotypes are marked on the right. The GenBank accession numbers of the reference NDV strains are listed in Additional file 2: Table S2. *, the strains investigated in this studyBack to article page