Neighbor-joining tree of COI sequence of <i>Rattus</i> and <i>Niviventer</i> collected from Hainan, Yunnan and Southeast Asia.

<p>Samples with black name and species name were collected from Hainan, those with blue name and species name were from Yunnan, and the red from Southeast Asia <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0043479#pone.0043479-Pages1" target="_blank">[21]</a>. Samples separated by small genetic distance (<2%) were labeled with one vertical black bar and regarded as one species. Low bootstrap support value (<90%) on deep branches were not shown.