main article: cell
Vitamin B9維生素B9葉酸folic acid, Vitamin B12維生素B12 Vit B12
synthesis of purine needs B9(Purine metabolism嘌呤生合成)[]

The synthesis of IMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, metal ions, inorganic molecules
synthesis of pyrimidine(pyrimidine metabolism嘧啶生合成)[]

The synthesis of IMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, metal ions, inorganic molecules
dTMP synthesis needs B9, B12[]

Pathway of tetrahydrofolate and antimetabolites by Author Luigi Albert Maria