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. 2015 Feb 19;6:44. doi: 10.3389/fmicb.2015.00044

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Copyright © 2015 Woycheese, Meyer-Dombard, Cardace, Argayosa and Arcilla.

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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SEM of a plant root carbonate casing, viewed in cross section. (A,B) Cross sectional view of bands of organic rich (org) and calcium-rich (ca) material. (C) Biofilm layer. (D) Close-up of box in (C) containing putative coccoid cells.