Core OTU network

<p>(spring embedded eweighted) of CCR (red), CCR+ (orange), UAF (blue) and UAF+ (green) samples. Node size represents OTU abundance and edge width and opacity is weighted. OTUs resolved to genus level are highlighted and font size correlates with OTU abundance. Bacterial genera in red represent potential spore formers. Samples treated with PMA prior to DNA extraction are indicated by a plus symbol. CCR: controlled cleanroom. UAF: uncontrolled adjoining facility.