FIG 4 .

5-Fluorouracil acts as a bacteriostatic agent, but 5-fluorouridine and 5-fluorocytosine have no effect on bacterial growth. P. aeruginosa was exposed to various concentrations of 5-fluorouracil (FU) (A), 5-fluorouridine (FUR) (B), or 5-fluorocytosine (FC) (C) for various times. Bacteria were then serially diluted to calculate the number of viable CFU per milliliter of medium. At least three biological replicates were done for each compound. Data from a representative replicate are shown.