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Phototactic colony migration assays of isolated mutants. (A) Positive swarm colony phototaxis toward an infrared-light source. (B) Negative phototaxis away from a visible-light source. Lanes: w.t., wild-type R. centenum; 1, ZJF6-4; 2, ZJF7-13; 3, ZJH7-24; 4, ZJO3-35; 5, YB300-3; 6, cheΔ mutant.
