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In the present study, we investigated the effect of a 50-Hz sinusoidal magnetic field at 1 mT rms field intensity on cell proliferation and micro-nucleus frequency in peripheral blood lymphocytes exposed for 72 h. Lymphocyte cultures from 5 subjects affected by Turner's syndrome were tested; cultures from 5 healthy donors were also studied to make a comparison with a control group. No statistically significant differences in micronucleus frequency and cell proliferation were found between control and exposed cultures from healthy and TS donors. The results obtained indicate that the field tested does not exert any genotoxic effect nor interfere with cell cycle.