Cell-Cell Contact during Gamma Irradiation Is Not Required to Induce a Bystander Effect in Normal Human Keratinocytes: Evidence for Release during Irradiation of a Signal Controlling Survival into the Medium

Killing of unirradiated cells by medium from cultures of irradiated cells implies the release of a cytotoxic substance by the irradiated cells. The finding of the γ-ray-induced cytotoxic effect exclusively in epithelial cells and not in fibroblasts suggested that tissue architecture or cell communic...

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