TABLE 1.

Base mismatch- and CPD-containing oligonucleotides used in this study

Oligonucleotide	Sequence	Strand designation(s)
XY-31mera	5′ GTACCCGGGGATCCTCCXAGTCGACCTGCA 3′	GX, AX, TX, CX (X = G, A, T, or C)
	3′ CATGGGCCCCTAGGAGGYTCAGCTGGACGT 5′	GY, AY, TY, CY (Y = G, A, T, or C)
CX/AY-41mer	5′ CGTTAGCATGCCTGCACGAACTAAGCAATTCGTAATGCATT 3′	CX
	3′ GCAATCGTACGGACGTGCTTAATTCGTTAAGCATTACGTAA 5′	AY
CPD-30merb	5′ CATGCCTGCACGAAT^TAAGCAATTCGTAAT 3′	30 D
	3′ GTACGGACGTGCTTA ATTCGTTAAGCATTA 5′	30 C

^aSeries of 16 different duplex oligonucleotides containing all possible base pair/mispair combinations between G, A, T, and C. In text, * denotes labeled strand (e.g., *CX/AY-31mer corresponds to C/A mismatch with the C-containing X strand as the labeled strand). 

^bContains a CPD designated T^T.