Mean diameter (in pixels) of the zone of inhibition (ZOI), a measure of antibiotic resistance, across ancestor (time zero) and bacteria isolated from biofilms at 15, 30, and 60 days. Individual replicates appear as distinct colors connected with a line. The ZOI of the ancestor is plotted at time 0 as an open circle.
Tyerman et al. BMC Evolutionary Biology 2013 13:22 doi:10.1186/1471-2148-13-22