Figure 1.

Subsystem matches in the nitrogen metabolism category. The proportional numbers of environmental gene tags that matched with level 2 sequences within the nitrogen metabolism subsystem category for the +NO3- (solid bars) and –N (open bars) metagenomes. No significant differences were found when these sequences were analyzed with Fisher exact tests in the Statistical Analysis of Metagenomic Profiles program.

Carrino-Kyker et al. BMC Microbiology 2013 13:78   doi:10.1186/1471-2180-13-78
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