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A) The pyrimidine synthase-catalyzed conversion of AIR 1 to HMP-P 2. Reduction of SAM 3 generates the 5-deoxyadenosyl radical 4, which triggers the rearrangement reaction by hydrogen atom abstraction from AIR 1. The colors in structures 1 and 2 show the origin of the atoms of HMP-P in the AIR structure. B) AIR showing the numbering of the ribose ring.
