Non-irradiated Bystander Fibroblasts Attenuate Damage to Irradiated Cancer Cells M. Widel, A. Szurko, W. Przybyszewski and J. Lanuszewska Radioprotection, 43 5 (2008) 158 Published online: 03 September 2008 DOI: 10.1051/radiopro:2008620