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A: Colonies of the wild type and the ΔacyA mutant T9 after eight days incubation at 30°C on DGasn minimal agar (5.5 cm Ø Petri dishes) supplemented with the indicated concentration of the cAMP analogue dibutyryladenosine 3′,5′-cyclic monophosphate. Middle pictures: detail of colony edges from the same cultures. Below: pigmentation of the back of the colonies.
