ribonucleic acid hybridization analysis indicated specific decrease of the messenger ribonucleic acid ( mrna ) for the purine salvage enzymes hypoxanthine-guanine phosphoribosyl transferase and adenine phosphoribosyl transferase in the small intestine and proximal colon but not in the liver of animals fed a diet lacking purines and pyrimidines .
C0035668
ribonucleic acid
C0035696
messenger ribonucleic