. "MODEL_NOTES= The biosynthesis of thiamin (Vitamin B1). Thiamin is a cofactor for a small number of decarboxylating enzymes that are central to metabolism. Website=www.biocyc.org/Ecoli/Pathways/ free text=Voet and Voet (textbook) Biochemistry"^^ . . "Thiamin biosynthesis"^^ . . . . . . . . . "Thiamin biosynthesis"^^ .