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Diagram showing a putative thiamine biosynthesis pathway. Black arrows indicate thiamine biosynthetic (TBS) pathway. HMP-P, hydroxymethyl pyrimidine phosphate; HMP-PP, 4-amino-5-hydroxymethyl-2-methylpyrimidine diphosphate; HET-P, 5-(2-hydroxyethyl)-4-methylthiazole phosphate; TMP, thiamine monophosphate; AIR, aminoimidazole ribotide; TPP, thiamine pyrophosphate.
