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. 2015 Jul 16;5:12153. doi: 10.1038/srep12153

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(a) amoA-b, (a) amoA-a, and (c) nxrA following addition of Ur at 1000 mg N kg⁻¹ soil with soils at 85% of FC. Asterisks indicate significant differences between soils at P < 0.05. Normalized gene abundances are expressed relative to the number of copies of prokaryotic (bacteria + archaea) 16S rRNA genes in each sample⁴⁷.