DNA excision repair was investigated in lymphocytes of persons occupationally exposed to low-dose radiation from222 Rn. Autoradiographic studies of unscheduled DNA synthesis and measurement of [3 H] thymidine incorporation by repair replication into double-stranded and single-strand-containing DNA fractions obtained by BND cellulose chromatography seem to indicate a stimulator effect of repeated low-dose irradiation on repair enzymes.

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