This image illustrates the chemical structure of a purine molecule, highlighting the numbering of the carbon and nitrogen atoms. The purine structure consists of a pyrimidine ring (positions 1 to 6) ...
De novo purine biosynthesis begins with the conversion of phosphoribosyl pyrophosphate (PRPP) to phosphoribosylamine, a reaction catalysed by glutamine phosphoribosylpyrophosphate amidotransferase ...
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