principal components of partially digested products in the intestinal lumen 1 h after the ingestion were uridine ( 33 % ) and cytidine ( 22 % ) in the case of [ 14c ] uracil , [ 14c ] cytosine-labeled rna and inosine ( 53 % ) in the case of [ 14c ] adenine-labeled rna , in accordance with the view that purines and pyrimidines in nucleic acids are absorbed mainly in the form of nucleosides .
C0041984
uridine
C0034289
pyrimidines