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. 2015 Dec 22;6:1492. doi: 10.3389/fmicb.2015.01492

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Copyright © 2015 Kamp, Høgslund, Risgaard-Petersen and Stief.

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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Vertical profiles of porewater nitrate (PWNO₃) and intracellular nitrate (ICNO₃) in (A) foraminifer-inhabited and (B) diatom-inhabited marine sediments. Nitrate concentrations are expressed per cm³ of sediment. Note different scales. Data compiled from (A) Risgaard-Petersen et al. (2006) and (B) Heisterkamp et al. (2012).