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Plaque formation by strains carrying suppressor mutations in the wild-type S. flexneri background on L2 cell monolayers. (a) 2457T (wild-type); (b) SSW202 (cydC1); and (c) SSW402 (ribE1). Plaques formed by SSW302 (pepP1) are identical in size and morphology to those formed by SSW402 (data not shown). The Inset in panel b is magnified 4×. Arrows indicate individual plaques. Plaques were photographed at 72 h postinfection. Bars, 1 cm.
