The nitrogen atoms of a purine originate from all of the following amino acids EXCEPT

Name: The nitrogen atoms of a purine originate from all of the following amino acids EXCEPT
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Purines are made up of a double-ring structure and contain two nitrogen atoms in positions 3 and 9 of the ring. The nitrogen atoms of purines are derived from various amino acids such as glycine, aspartate, glutamine, and bicarbonate. Cysteine does not contribute nitrogen atoms to the purine ring.

The Nitrogen Atoms of a Purine Originate from All of the Following