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Self-induction of a same-sex white a/a cell biofilm depends upon WOR1, the master switch gene necessary for the white-to-opaque transition. Biofilms (48 h) were analyzed for the parental strain P37005, the deletion wor1/wor1 mutant, and the wor1/wor1-WOR1 complemented mutant. See the legend to Fig. 1 for explanations of the panels.
