Table 2.

Endogenous DNA damages/cell/day for humans

DNA damages	Reported rate of occurrence
Oxidative damages	10000[24]
Depurinations	9000[25]
Depyrimidations	696[26]
Single-strand breaks	55000[26]
Double-strand breaks	Approximately 50/cell cycle[27]
O6-methylguanine	3120[26]
Cytosine deamination	192[26]