Examples of regulatory elements identified by the functional screen. Each row represents a single candidate RNA switch, each column represents a single bin defined by the reporter gene expression (eGFP fluorescence, normalized by mCherry fluorescence). Bin 1 corresponds to the cells with the lowest eGFP fluorescence, bin 8 corresponds to the highest. The value in each cell is the relative abundance of the given RNA switch in the given bin, normalized across the eight bins. The three plots show examples of candidate switches with repressive, neutral and activating effects on gene expression. The plots below show cumulative sequence abundances across all of the candidate switches in each group.