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5-FOA sensitivity of strain HTA426 and mutant strains MK54, pyrF-complemented MK54 (MK54c), MK72, and pyrF-complemented MK72 (MK72c). Overnight cultures (105 cells) were applied as spots and incubated for 24 h on MM plates containing uracil and 5-FOA at the indicated concentrations (mg/liter).
