Antibiotic resistance gene families (identified in ARDB) were identified throughout the building but at lower relative abundances than observed elsewhere. a) Dot plot of the relative abundance (in RPKM) of each antibiotic gene class by sample. b) Violin plot, showing the median (white dot) and quartile ranges (box and whiskers) as well as the density distribution (shaded area) of the relative abundance of all antibiotic resistance gene families (in RPKM) from the present study (purple, n = 36), other built environment microbiomes (blue, n = 40), and the human microbiome (teal, n = 552). Graphic: Hartmann, et al., 2016 / Environmental Science & Technology