FIG. 6.

ras2 mutants produce less pheromone and are attenuated for pheromone signaling. Wild-type cells respond to pheromone from compatible cells by producing conjugation tubes that are oriented towards their mating partner (top left). Mutants deficient in ras2 produce very few conjugation tubes when spotted next to wild-type cells. Conversely, fewer conjugation tubes are formed from wild-type cells in response to pheromone produced from ras2 mutants (top right and bottom left). ras2 mutants fail to produce conjugation tubes when spotted beside compatible ras2 partners (bottom right).