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Photosensitivity of the tolC mutant strain grown in the presence of ALA. Cells grown at 30°C for 24 h in the presence (closed symbols) or absence (open symbols) of 10 μg/ml ALA were exposed to near-UV light at 366 nm, and the number of viable cells was counted as described in Materials and Methods. Circles, JA300 (wild-type strain); triangles, JA300T (containing tolC). The means (symbols) and standard deviations (error bars) are shown (n = 3).
