DNA Breaks, Double-Stranded DNA Repair 6 Histones 6 article 6 clonogenic assay 6 priority journal 6 Biological Markers 4 DNA 4 DNA damage 4 Gamma Rays 4 High linear energy transfers 4 Humans 4 Linear Energy Transfer 4 Phosphorylation 4 Radiation Tolerance 4 animal cell 4 controlled study 4 double stranded DNA 4 double stranded DNA break 4 female 4 gamma radiation 4 histone H2AX 4 linear energy transfer 4 nonhuman 4 protein phosphorylation 4 radiation dose 4 Animals 2 Basic Helix-Loop-Helix Transcription Factors 2 CHO Cells 2 CHO cell 2