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The PN model of the UTP subnet adapted from Nöthen (2014). It covers part of the synthesis of uridine 5′-phosphate, UMP, (red), and the interconversion of the pyrimidine ribonucleotides. The interconversion are the reversible transformation of UMPP, UDP, and UTP and CMP, CDP, and CTP into each other. Additionally, it contains the CTP synthesis CTP from UTP and degradation of CMP to UMP.
