FIG 2.

Reduction of suppressor mutations in UPP-Pase depletion strains. Fractions of suppressor mutants in populations of various depletion strains. UPP-Pase depletion strains cannot grow on LB plates containing 2% xylose unless they have a suppressor mutation. Cells were plated on LB plates with or without 2% xylose, and the number of cells on each type of plate was counted and back calculated to CFU/ml. The fraction of suppressor mutants in each population was calculated by dividing the CFU count of suppressors by the CFU count of total cells. Error bars show standard deviations.