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Human lymphocyte culture of two healthy donors was carried out.[3] Later, metaphases were examined for different types of aberrations. For sister chromatid exchange analysis, bromodeoxyuridine (10 μg/ml) was added at the beginning of the culture.[4] Cell cycle kinetics was studied by the BrdU‐Harlequin technique using the replication index (RI) calculated by the standard formula.[5] The Student...