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. 2015 Dec 22;6:1457. doi: 10.3389/fmicb.2015.01457

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Copyright © 2015 Ben Maamar, Aquilina, Quaiser, Pauwels, Michon-Coudouel, Vergnaud-Ayraud, Labasque, Roques, Abbott and Dufresne.

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.

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Taxonomic composition of groundwater samples. In (A) percentages of sequences assigned to the main phyla of bacteria. For sequences assigned to Proteobacteria, percentages represent the class level. In (B) is presented percentages of sequences for families of Betaproteobacteria. Taxa with less than 10 sequences detected are gathered in the category ≪ other ≫ in (A) and ≪ other families ≫ (B). Abbreviations: P-R2, Ploemeur-Recent 2; P-R1, Ploemeur-Recent 1; B-R, Betton-Recent; B-O, Betton-Old; SB-O1, Saint-Brice-Old 1; SB-O2, Saint-Brice-Old 2; uncl., unclassified.