| tetrahymena thermophila | A species of ciliate protozoa used in genetic and cytological research. (12 Dec 1998) |
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| Tetrahymena | Genus of ciliate protozoa frequently used in studies on ciliary axonemes, self splicing RNA and telomere replication. (18 Nov 1997) |
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| tetrahymena pyriformis | A species of ciliate protozoa used extensively in genetic research. (12 Dec 1998) |