Transcription factor which mediates CO(2) sensing. Required for CO(2)-induced white-to-opaque switching, as well as for filamentous growth and virulence. Required for both normoxic and hypoxic biofilm formation. Hypoxic biofilm formation is a major cause of perseverance and antifungal resistance during infections. Interacts with EFG1 and MSS11. Belongs to the FLO8 family.