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The nonpathogenic ciliate Tetrahymena thermophila converts cholesterol from foodstuffs into provitamin D compounds in high yields. However, prolonged incubation with wild-type strain CU-399 at high densities results in a final deterioration of milk properties, possibly as a result of secreted hydrolases. Here we attempted to solve this problem using MS-1 Tetrahymena strain, a stable mutant with a...
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