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  • Title: [Proliferative activity of Shvetz tumor following single and repeated irradiation].
    Author: Potapov SL, Sokolova LV.
    Journal: Biull Eksp Biol Med; 1975 Nov; 80(11):84-7. PubMed ID: 1218268.
    Abstract:
    Autoradiographic study of an experimentally-induced tumour following local irradiation in a dose of 600 rad showed no retardation of the cell cycle 6 to 12 hours after the irradiation. Marked reduction of the mitotic index (MI) and of the labeled nuclei index (LNI) was noted to the 96th hour after the irradiation. In repeated irradiation in a dose of 1200 rad at an interval of 18 hours there was revealed a marked reduction of the MI and of the LNI as a result of the block of the passage of cells from the G1-period into S. However, restoration of the cell proliferation uas noted by the 24th-48th hours. A high MI revealed at all the periods of investigation after repeated tumour irradiation at an interval of 24 hours was possibly caused by an increase in the time of mitosis proper, this also being confirmed by a significant accumulation of the number of late mitotic phases.
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