Location-specific metagenomic profiles are disturbed by increases in relative abundances of genomic reads.

<p>(A) Dendrogram of the air samples with three nodes: (I) main lobby (L) samples shaded green, (IIa-c) duct (D) samples shaded yellow and (IId,III) outlier samples shaded blue. Significant differences between nodes (<i>p</i><0.05) are noted by an asterisk. (B) Corresponding microbial metagenomic profiles represented by the percent distribution of normalized (to 1 M) read counts for 26 orders with >1% microbial abundance. Color schemes represent orders grouped by class or phylum. “Other” is represented by the percent sum of the remaining 24 orders.