M00051 De novo pyrimidine biosynthesis, glutamine (+ PRPP) => UMP
M00052 Pyrimidine ribonucleotide biosynthesis, UMP => UDP/UTP,CDP/CTP
M00938 Pyrimidine deoxyribonucleotide biosynthesis, UDP => dTTP
M00046 Pyrimidine degradation, uracil => beta-alanine, thymine => 3-aminoisobutanoate
M00939 Pyrimidine degradation, uracil => 3-hydroxypropanoate
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