[Comparative study of the radiosensitivity of normal and regenerating tissues. 1. Interphase cell death and degree of aplasia of regenerating and normal bone marrow and spleen tissues in C57Bl mice].

A comparative study of radiosensitivity of cells of normal and regenerating tissues of bone marrow and spleen has demonstrated that single exposure to X-rays produces a lesser damaging effect on regenerating tissues than on normal ones. The data obtained indicate that the increase in radioresistance of the organism during active regeneration of the haemopoietic organs is due not merely to the increase in the dividing cell pool of these organs but also to qualitative changes in their functional state.