target theory

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A theory developed to explain some biological effects of radiation on the basis of ionization occurring in a very small sensitive region within the cell. One or more “hits,” that is, ionizing events, within the sensitive volume are postulated to be necessary to bring about the effect. See Chronology, 1936, Timofeyeff-Ressovsky and Delbrück; extrapolation number.

Subjects: Chemistry — Genetics and Genomics.

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