Repair kinetics of radiation-induced DNA damage under microgravity conditions. Repair kinetics of radiation-induced DNA damage under microgravity conditions. (A) Rejoining of DNA strand breaks in X-irradiated cells of E. coli B/r. (B) Induction of SOS response in X-irradiated cells of E. coli PQ37. (C) Survival of spores of B. subtilis HA 101 after UV irradiation. (Modified from reference 112 with permission of the publisher.) Gerda Horneck et al. Microbiol. Mol. Biol. Rev. 2010; doi:10.1128/MMBR.00016-09