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The effect of recombinant interferon-alpha-2a (rIFN-alpha-2a) on the induction of chromosomal aberrations (CAs) by the radiomimetic antibiotic bleomycin (BLM, 5μg/ml, 30min, 37 o C) in Chinese hamster ovary (CHO) cells was investigated. Recombinant IFN-alpha-2a (4500-180,000IU/ml) was added to the cell cultures 0.5 or 24h before BLM (and left in the culture medium until the end of treatments)...