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The chromatin of the lepidopteran Ephestia kuehniella was digested by micrococcal nuclease, DNase I and S1-nuclease combined with DNase I pretreatment. The resulting DNA fragments were analyzed by gel electrophoresis and compared with the DNA fragments of rat liver nuclei obtained by the same process. Extensive homology was revealed between insect and mammalian chromatin structure. The combined DNase I- S1-nuclease digestion yields double-stranded DNA fragments of lengths from 30 to 110 base-pairs. These DNA fragments are not obtained from nuclei predigested extensively with micrococcal nuclease. The results are discussed with respect to the internal structure of the chromatin subunit.

Digestion of insect chromatin with micrococcal nuclease, DNase I and DNase I combined with single-strand specific nuclease S1