Phylogenetic trees - North American origin H9 gene segment trees

Phylogenetic trees corresponding to nucleotide sequences of gene segments in avian H9 viruses isolated from North America. Data are written in Newick format.本数据集包含对应于从北美分离的禽H9病毒各基因片段核苷酸序列的系统发育树（Phylogenetic trees），所有数据均以Newick格式（Newick）存储。