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. 2013 Feb 7;8(2):e55927. doi: 10.1371/journal.pone.0055927

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© 2013 Zhang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The X-axis relates to the K2P distances of the three combined DNA regions (ndhF, trnS-trnG and waxy) between the four quarantine species and their closest relatives. 1. S. elaeagnifolium; 2. S. carolinense; 3. S. torvum; 4. S. rostratum. The Y-axis corresponds to the number of occurrences.