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Catabolism of pyrimidine rings. Pyrimidine rings of cytosine and thymine can be completely degraded. Catabolism of the cytosine and thymine leads ultimately to β-alanine or β-aminoisobutyrate production, as well as NH3 and CO2. (Adapted from Moran et al. 2012, p. 570, by permission of Pearson Education Inc., Upper Saddle River, New Jersey.)
