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Fission Yeasts
1 species
Schizosaccharomyces is the genus of fission yeasts. Its rod-shaped cells grow at their ends and divide by splitting across the middle, unlike the budding of baker's yeast. The genus forms a broad and ancient lineage within Ascomycota and has five recognized species: S. pombe, S. japonicus, S. octosporus, S. cryophilus and S. osmophilus. S. pombe, first isolated from East African millet beer, is a leading model organism for studying the cell cycle.
Unicellular, rod-shaped yeasts with tip growth and medial fission; no budding. Mostly haploid; zygotic asci with four ascospores in S. pombe after mating under starvation.
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