Abstract
The reassociation kinetics of DNA fragments obtained from the major components of the mouse and human genomes (recently isolated in our laboratory) have been investigated. It has been found that the relative amounts of interspersed repeated and unique sequences strikingly differ in the different major components of each genome and in the corresponding major components of the two genomes. Furthermore, within each major component, the interspersed repeated and unique sequences do not differ in dG + dC contents. These findings lead to the general conclusion that the sequence organization of mammalian genomes is not uniform in different chromosomal regions and that it exhibits remarkable variations in different mammals.
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