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An investigation of the properties of a number of genes of Drosophila, obtained by cloning recombinant DNAs, led to the detection of a new type of organization of genetic material. It was found that a number of actively working structural genes of Drosophila are represented by a large number of copies, scattered over its chromosomes. Their localization in the chromosomes is variable, although they are always detected in regions of intercalary heterochromatin. The latter evidently is a site of accumulation of various multiple genes.

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