AAD	ATR activating domain (in TopBP1)
ATM	Serine-protein kinase ATM
ATR	Serine/threonine-protein kinase ATR
BSA	Bovine serum albumin
Cdc45	Cell division control protein 45 homolog
Cdc6	Cell division control protein 6 homolog
Cdt1	DNA replication factor Cdt1
Chk1	Serine/threonine-protein kinase Chk1
CldU	5-Chloro-2′-deoxyuridine
CMG	Cdc45-MCM-GINS complex
DDK	Dbf4-dependent kinase
EdU	5-Ethynyl-2′-deoxyuridine
ETAA1	Ewing’s tumor-associated antigen 1
eGFP	Enhanced green fluorescent protein
GEMC1	Geminin coiled-coil domain-containing protein 1
GINS	Sld5-Psf1-Psf2-Psf3 complex (go-ichi-ni-san)
H2A.X/γH2AX	Phosphorylated histone H2AX
IdU	5-iodo-2′-deoxyuridine
kb	kilobase
MCM2-7	DNA replication licensing factor MCM2-7
ORI	Origin of DNA replication
p21	Cyclin-dependent kinase inhibitor 1
p27	Cyclin-dependent kinase inhibitor 1B
p53	Cellular tumor antigen p53
PARP	Poly (ADP-ribose) polymerase
PBS	Phosphate-buffered saline
RecQL4	ATP-dependent DNA helicase Q4
RPA	Replication protein A complex
S-CDK	S-phase-specific cyclin dependent kinase
SA-β-Gal	Senescence-associated beta-galactosidase
ssDNA	Single-stranded DNA
TopBP1	DNA topoisomerase 2-binding protein 1
U2OS	Human osteosarcoma cell line
UV-C	Ultraviolet C (254 nm)
WT	Wild type