Osmotic balance regulates cell fusion during mating in Saccharomyces cerevisiae.

Although the number of prezygotes does not return to wild-type levels when fps1Δ mutants are mated with fps1Δ mutants, the reduction in the number of prezygotes compared with fps1Δ mutants mated to wild type may be significant (Table II ), indicating that a difference in osmolarity between mating partners may be monitored.

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