This study was aimed to characterize pattern of occurrence of spontaneous single-strand breaks in situ in glial and neuronal nuclei of the cortex, middle brain and hyppocapmi (CA3 field) of rats selected for a threshold of nervous system excitability, and to study the influence of stress of various modality on such breaks. The results obtained evidence that: 1) intact animals possess a subpopulation of glial and neuronal cells revealed following gap filling in situ in opposite to other types of terminally differentiated non-proliferating cells; 2) the size of such a subpopulation differs depending on the lines of examined rats, parts of brain, and the type of stress.
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