82. A researcher wants to isotope label purines with 15N for future spectroscopic studies. Which substrates when labeled with the heavy nitrogen would result in the most1 15N-enriched purines through de novo synthesis?
(A) Glutamine, aspartate, glycine
(B) Glycine, glutamine, N10-fbrmyl-THF
(C) Aspartate, glutamine, asparagine
(D) Glycine, carbamoyl aspartate, glutamine
(E) Aspartate, glycine, 5-phosphoribosyl»a-pyrophosphate
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