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Comparison of the luminescence of P. leiognathi-luxG knockout and of native P. leiognathi TH1. Both strains were cultured on the same LB agar plate at 28°C for ∼16 h. The picture was taken in the dark by using a Canon Powershot A620 digital camera with an exposure time of 30 s and an aperture of 4.0. This result indicates that the luxG knockout strain was much less luminescent that the native strain.
