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Abstract. In the yeast Saccharomyces cerevisiae, uridine ribohydrolase activity is important for recycling, via the salvage pathway, pyrimidine deoxy- and ribonucleosides into uracil required for the growth of strains lacking the de novo pyrimidine synthesis pathway. We have shown that not only uridine and cytidine, but also 5-fluorouridine, 5-fluorocytidine and deoxycytidine are substrates for this...