Amphiphysin-like regulator of cell fusion; cytoplasmic protein that localizes at the shmoo tip and the zone of cell fusion in prezygotes and is required for both cell fusion and the alignment of parental nuclei before karyogamy during mating; contains a Dbl-homology domain; interacts with activated, GTP-bound Cdc42p, resulting in focused accumulation at the zone of cell fusion and spatially regulated secretion of cell wall remodeling enzymes