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. 2017 Sep 4;8:1685. doi: 10.3389/fmicb.2017.01685

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Copyright © 2017 Liu, Zhang, Shao and Wang.

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) or licensor 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.

PMC Copyright notice

The NR-PKS phylogenetic tree and analysis of PRE domains in 574 NR-PKS sequences. (A) NR-PKS phylogenetic tree of 574 sequences. The different types of PRE domains in NR-PKSs have been colored. The branches of NR-PKSs in eight groups (groups I–VIII) have been labeled. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. (B) Statistical analysis of PRE domains in 574 NR-PKSs. The sequence numbers of NR-PKSs in groups I–VIII are 39, 93, 75, 77, 89, 56, 100, and 45, respectively.