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Salvage pathways for uracil and cytosine. Gene names are used to represent the encoded proteins. Excluding those shown in Fig. 1, the genes and their encoded proteins are as follows: cdd, cytidine deaminase; cmk, CMP kinase; codA, cytosine deaminase; codB, cytosine permease; udk, uridine kinase; udp, uridine phosphorylase; upp, UPRTase; and uraA, uracil permease.
