Summary of growth in the presence of arabinose-induced TBCs.

Results of dilution plating (Fig 3) were categorized in comparison to wild-type dilution series on the same plate. The number in each entry indicates which dilution tube showed growth (more than one colony) relative to the wild-type series (+1 indicates that the mutant grew in the next more dilute spot than the wild type while -1 indicates that the mutant grew in the next more concentrated spot; note that each dilution step was five-fold, and so a reading of -3 would correspond to a dilution factor differential of 125). The differential in 0.01% arabinose (Ara) is sometimes not as dramatic as that in 0.003% arabinose because the wild type did not grow in the more dilute spots on the 0.01% plate (not because the mutant grew better at the higher arabinose concentration). The downward arrow next to the number indicates that the colonies that did grow were noticeably smaller than the corresponding wild-type colonies on the same plate or that no colonies grew in the corresponding mutant series. Both negative numbers and downward arrows provide evidence for hypersensitivity.* Mutants designated as hypersensitive are indicated by an asterisk.Summary of growth in the presence of arabinose-induced TBCs.