Figure 5.

Result of the Illumina MiSeq sequencing of the gradient constructed with DNA from adults fed on diet supplemented with urea (531, 465 sequences in total). The relative abundance of bacterial families in dense pooled fractions of ¹⁴N and ¹⁵N gradients, in percentage of total sequences, is displayed in (A). The enrichment or underrepresentation of bacterial families in the medium lower pooled fractions of the ¹⁵N gradient compared to the same fractions in the ¹⁴N gradient, as a measure of the activity in the processing of urea, is shown in (B). Blue represents underrepresentation (inactive families), while yellow represents enrichment (active families). ^*p < 0.05; ⁺ p < 0.1.