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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
    ... to substi- tute alternate purine (transition) or pyramidine (transversion) linkages into the DNA molecule has resulted in ... H^ (tritium) and its sub- sequent labelling to thymidine has given a power- ful tool m the ...