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  1. NLM Digital Collections - Review of intramural research (1961) 
    Publication: [Bethesda, Md.] : U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health
    resource.nlm.nih.gov/0141176X3
    ... the usual purine and pyrimidine bases : adenine, guanine, cytosine and uracil with adenine most abundant and cystosine the least abundant. In addition, nucleotides of hy|)0xanthine are found indicating the activity of adenosine deaminase. NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES ...