A thorough cytogenetic analysis using G-banding was performed on 100 peripheral blood lymphocytes from an individual who had been accidentally exposed to radiation more than 25 years previously. More than 60% of the analysed cells were found to possess one or more stable chromosome aberrations (e.g. reciprocal translocations). Chromosomes 1 and 11 were more involved in these aberrations than would be expected from the relative chromosome lengths. No identical stable aberrations were found, suggesting that, 25 years after near-lethal exposure, haemopoietic stem cells display substantial diversity.
Maes, A., Hilali, A., Leonard, ED., Leonard, A., & Verschaeve, L. (1993). Stable Chromosome-aberrations 25 Years After Severe Accidental Radiation Exposure. Radiation and Environmental Biophysics, 32(4), 319-324. https://doi.org/10.1007/BF01225919 (Original work published 1993)