MFS antiporter that does not display functional linkage as drug transporter and performs functions that significantly affect biofilm development and virulence. No substrate for transport has been identified yet, but plays an important role in the growth in the host. Preferentially localizes to membrane rafts. Expression is repressed by caspofungin and during chlamydospore formation. Also regulated during white-opaque switch, and by NRG1, TUP1 and HAP43. Leads to defects in biofilm architecture. Belongs to the major facilitator superfamily. CAR1 family.