In response to x-irradiation, G2 stage leukocytes are about 4 times more sensitive than G0 stage cells, and S stage is intermediate when sensitivity is measured as percent abnormal cells. The yield of interchange type aberrations, however, is lowest for S cells, confirming the work of J. G. Brewen. Chromosome terminal deletions increase as the <tex-math>$\text{dose}^{1.19}$</tex-math>, while dicentrics follow <tex-math>$\text{dose}^{1.58}$</tex-math>.

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