SummaryThe value of K depends on the pre-irradiation growth conditions of the mouse Ehrlich ascites tumour. Cells were grown either in vivo or in vitro but were irradiated and assayed in vitro. K was 1·8 times greater for cells grown in vitro, demonstrating that K is not invariant for mammalian cells, nor even for the same cell-line.
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Cullen et al. (1974) studied this question.
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