核苷酸的生物合成 1. Nucleotides are synthesized via either the de novo pathways or the salvage pathways In the de novo pathway simple precursors, including amino acids, PRPP, NH+ CO2r and one-carbon units(carried on Ha folate) are used In the salvage pathway the free bases and nucleosides released from nucleic acid breakdown are used二、核苷酸的生物合成 1. Nucleotides are synthesized via either the de novo pathways or the salvage pathways • In the de novo pathway simple precursors, including amino acids, PRPP, NH4 +, CO2 , and one-carbon units (carried on H4 folate) are used. • In the salvage pathway the free bases and nucleosides released from nucleic acid breakdown are used