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. 2019 Dec 20;10:2910. doi: 10.3389/fmicb.2019.02910

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Copyright © 2019 Chen, Wu, Chen, Li, Li, Zhang, Pang, Wang, Zhao and Shen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Phylogenetic tree of the groEL gene fragments cloned by the primer pair Spa146f-Spa525r from the saliva of six human subjects and those of known Streptococcus species. The cloned sequences of the present study are labeled by dots of varied colors, and clones of the identical color are from the saliva sample of one person. Strains of known Streptococcus species retrieved from the GenBank are indicated by italics, and the accession numbers of their groEL genes are given in parentheses following the bacterial names. Bootstrap values greater than 50% are indicated at the nodes.