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. 2019 Sep 13;10:2141. doi: 10.3389/fmicb.2019.02141

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Copyright © 2019 Muck, De Corte, Clifford, Bayer, Herndl and Sintes.

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) and the copyright owner(s) 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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Depth profiles of functional gene abundances: archaeal nirK-a (A) and nirK-b (B) and bacterial nirK (C) archaeal HAC-amoA (D) and LAC-amoA (E) nitrification genes measured by q-PCR. amoA-HAC, “high-ammonia concentration” archaeal amoA; amoA-LAC, “low-ammonia concentration” archaeal amoA; nirK-a and nirK-b, archaeal nitrite reductase K type a and b; bac nirK, bacterial nitrite reductase K.