GRABS score with and without CCCP, a proton ionophore that reduces membrane potential. Solid circles, representing GRABS score for the dimethyl sulfoxide (DMSO) control, are generally at lower values than the open circles, which represent GRABS score in the presence of 2 μg/mL CCCP. Genes are colored according to their assignment to Clusters of Orthologous Groups. Solid lines and shaded areas represent the average and 95% confidence interval to a linear fit, respectively, of n ≥ 4 independent experiments.