animal cell 6 article 6 histone H2AX 6 linear energy transfer nonhuman 6 protein phosphorylation 6 Biological Markers 4 DNA 4 DNA Breaks, Double-Stranded 4 DNA Repair 4 DNA damage 4 High linear energy transfers 4 Histones 4 LET 4 Linear Energy Transfer 4 Phosphorylation 4 Radiation Tolerance 4 clonogenic assay 4 controlled study 4 double stranded DNA break 4 immunofluorescence 4 ionizing radiation 4 lithium 4 priority journal 4 radiation dose 4 radiosensitivity 4 unclassified drug 4 γH2AX 4 Animals 2 CHO Cells 2