Component of the pheromone signal transduction pathway. It mediates pheromone signals acting between STE20 and STE11. It is absolutely required for pheromone-induced transcription of FUS1. May play a role in cell-cycle arrest in response to pheromone. May be regulated at the phosphorylation level, and by the mating type of the cell and depends on an intact pheromone-response pathway. Present with 1900 molecules/cell in log phase SD medium. To yeast FAR1.