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Radiation and Genome Stability Unit, Medical Research Council, Harwell, Oxfordshire OX11 0RD, United Kingdom
Using a bone marrow transplantation protocol in which we transplanted a mixture of irradiated and nonirradiated bone marrow cells that were distinguishable by a cytogenetic marker, we have demonstrated chromosomal instability in the progeny of nonirradiated hemopoietic stem cells. This first demonstration of a link between a bystander effect of ionizing radiation and the induction of genomic instability in vivo clearly poses a major challenge to current views of the mechanisms of radiation-induced DNA damage with mechanistic implications for the health consequences of radiation exposure particularly in the context of the induction of malignancy.
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