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The DNA extracted in macromolecular form from human leukemic leucocytes has been fractionated in Ag+- Cs2SO4 and Hg++-Cs2SO4 preparative density gradients. Three satellite DNAs and a repeated DNA fraction have been isolated and their properties have been compared in leukemic and normal tissues. So far, no difference has been found with the techniques used
Corneo et al. (Thu,) studied this question.