ATM	ataxia telangiectasia-mutated kinase
ATR	ataxia telangiectasia and Rad3-related kinase
CF	caffeine
dNTPs	deoxyribonucleoside triphosphates
DSB	double-strand break
EC	euchromatin
HC	heterochromatin
HR	homologous recombination
HU	hydroxyurea
PCC	premature chromosome condensation
PCD	programmed cell death
PCP II	principal control point II
SSB	single-strand break