Acta Biol Hung 1990 41 (1-3) p209-13 X-ray irradiation inhibits DNA synthesis and enhances the frequency of sister chromatid exchanges (SCE) in normal human lymphocytes.
Cells from patients with Down's syndrome, Xeroderma pigmentosum (form II) and progeria, characterized by radioresistant DNA synthesis, do not show such an increase in SCE frequency.