title: 5′-Phosphoribosyl-4-carboxy-5-aminoimidazole
text: # 5′-Phosphoribosyl-4-carboxy-5-aminoimidazole
  
  5′-Phosphoribosyl-4-carboxy-5-aminoimidazole (or CAIR) is an intermediate in the formation of purines.
  
  It is formed by phosphoribosylaminoimidazole carboxylase.
  
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