Transcriptional regulator involved in extension of germ tubes into elongated hyphae and maintenance of filamentous growth. Regulates expression of UME6. Acts in a pathway that regulates maintenance of hyphal growth by repressing hyphal-to-yeast transition and allows dissemination within host epithelial tissues. Dispensable for invasion into both host oral epithelial cells and enterocytes, but required for epithelial damage. Regulated by EFG1, NRG1, and TUP1. Expression is increased with increasing cell density and during host infection. Expression is repressed by linalool. Leads to yeast-locked cells.