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ACT production (blue colour) of the parent strain (M145) and the mutant ΔabrA1/A2 (ΔabrA) in NMMP complete medium and different modified versions lacking (w/o) one or several compounds of the original recipe. All plates were inoculated as a lawn with 7.5×106 spores of the corresponding strains and the images correspond to backward sections of the plates after four days at 30°C.
