25.1 The Pyrimidine Ring Is Assembled de Novo or Recovered by Salvage Pathways
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25.2 Purine Bases Can Be Synthesized de Novo or Recycled by Salvage Pathways
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25.3 Deoxyribonucleotides Are Synthesized by the Reduction of Ribonucleotides Through a Radical Mechanism
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25.4 Key Steps in Nucleotide Biosynthesis Are Regulated by Feedback Inhibition
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25.5 Disruptions in Nucleotide Metabolism Can Cause Pathological Conditions
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