Pol	DNA polymerase
NHEKs	normal human epidermal keratinocytes
UV	ultraviolet
CPDs	cyclobutane pyrimidine dimmers
TT-CPDs	TT-cis-syn CPDs
TdT	terminal-deoxynucleotidyl transferase
TLS	translesion DNA synthesis
KGM	keratinocyte growth medium
dTTP	2′-deoxythymidine-5′-triphosphate
DMSO	dimethyl sulfoxide
dNTP	2′-deoxynucleotide-5′-triphosphate
ELISA	enzyme-linked immunosorbent assay
MTT	3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide
SEM	standard error of the mean
NER	nucleotide excision repair
XP	xeroderma pigmentosum
BER	base excision repair