Abstract
THE deoxyribonucleic acid (DNA) molar nucleotide composition varies greatly among bacterial species, and certain pyrimidine deoxyribonucleotides are present in the DNA of bacterial viruses which are not found in the DNA of the host bacteria1,2. Conversely, rather similar DNA nucleotide compositions are found for a number of animal species and for the different tissues of the same animal3,4. A single animal cell may, however, contain as many as 300,000 DNA molecular types. It is reasonable to assume that some of these are distinctive for animal species. Data supporting this hypothesis are presented here.
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References
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KIT, S. Species Differences in Animal Deoxyribonucleic Acids as revealed by Equilibrium Sedimentation in Density Gradients. Nature 193, 274–275 (1962). https://doi.org/10.1038/193274a0
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DOI: https://doi.org/10.1038/193274a0
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