Elizabeth A. Ainsbury,^1,*,** Claudia Dalke,^2,** Mariateresa Mancuso,^3,** Munira Kadhim,⁴ Roy A. Quinlan,⁵ Tamara Azizova,⁶ Lawrence T. Dauer,⁷ Joseph R. Dynlacht,^8,** Rick Tanner,¹ Nobuyuki Hamada<sup>9,**

1</sup>Public Health England (PHE) Centre for Radiation, Chemical and Environmental Hazards, Oxon, United Kingdom
²Institute of Developmental Genetics, Helmholtz Zentrum München GmbH - German Research Center for Environmental Health, Neuherberg, Germany
³Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
⁴Department of Biological and Medical Sciences, Faculty of Health and Life Sciences, Oxford Brookes University, Oxford, OX30BP, United Kingdom
⁵Department of Biosciences, Durham University, Durham DH1 3LE, United Kingdom
⁶Southern Urals Biophysics Institute, Ozyorsk, Russia
⁷Memorial Sloan Kettering Cancer Center, New York, New York
⁸Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana
⁹Radiation Safety Unit, Biology and Environmental Chemistry Division, Sustainable System Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Komae, Tokyo, Japan

^*Address for correspondence: Cytogenetics Group Leader, Public Health England Centre for Radiation, Chemical and Environmental Hazards (PHE CRCE), Room C1.32, Chilton, Didcot, Oxon OX11 0RQ, UK; email: liz.ainsbury@phe.gov.uk.
^**Focus Issue guest editor.