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But in all that time, they've never known how each cell's sex, or "mating type," is determined; now they do.
The new findings are published 26 March in the open access journal PLOS Biology.
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By identifying Tetrahymena's long-unknown mating-type genes, a team of UC Santa Barbara biologists, with research colleagues in the Institute of Hydrobiology of the Chinese Academy of Sciences, and in the J.
Craig Venter Institute, also uncovered the unusual process of DNA rearrangements needed for sex determination in this organism.
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