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Effect of blue, red, and white light on the β-galactosidase activity of ytvA-overexpressing strain PB198/pYtvA. At time zero, cells were induced with 1 mM (end concentration) IPTG. Light intensities were 50 microeinsteins m−2 s−1 for standard white-light illumination and 30 microeinsteins m−2 s−1 for red- and blue-light illumination. Error bars indicate standard deviations calculated from two independent experiments, each with duplicate samples.
