Abstract
The kinetics of nuclease digestion of Physarum polycephalum nuclei by staphylococcal nuclease and DNase I has been studied at different stages of the cell cycle. Significant differences in the digestion behaviour of nuclei from metaphase and interphase have been detected with DNase I but not with staphylococcal nuclease. Furthermore the structure of newly replicated DNA in S phase differs from the bulk in that it is more easily degraded to acid-soluble products by either staphylococcal nuclease or by DNAase I. At least four types of chromatin structure can be distinguished by our digestion kinetics experiments.
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