Abstract
The induction of micronuclei in human cord blood lymphocytes by treatment with γ-irradiation and bleomycin has been measured. Culture durations which gave peak MN frequencies were determined. The lowest tested doses, 0.1 Gy irradiation and 1.25 μg/ml bleomycin, produced significant increases in the frequency of micronuclei. The spontaneous frequency of micronucleated lymphocytes in 28 cord blood samples ranged between 0.5 and 9.5 per thousand lymphocytes, with a modal value of 2.5. The method is evaluated for its potential usefulness in monitoring populations for chromosome breakage.
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