FIG 3.

Radial growth of the A. niger ΔwarA mutant growing on different weak acids. Plates were inoculated with a 10-fold dilution series of conidial suspensions; approximate numbers of conidia are indicated above the pictures. Images were captured after 2 days of growth at 28°C and are representative of 2 or 3 independent experiments. The concentrations of acids used are given in Materials and Methods.