Table I. Oligonucleotides used in the experiments.

Name	Sequence
19T	5′-ACAGACGCCATCAACCAGG-3′
19Tg	5′-ACAGACGCCATgCAACCAGG-3′
19Urea	5′-ACAGACGCCAUreaCAACCAGG-3′
19U	5′-ACAGACGCCAUCAACCAGG-3′
19comp	5′-CCTGGTTGATCGCGTCTGT-3′
25oxoG	5′-CATCGATAGCATCCToxoGCCTTCTCTC-3′
25comp	5′-GAGAGAAGGCAGGATGCTATCGATG-3′
15mer	5′-CATCGATAGCATCCT-3′
30T	5′-CTCGTCAGCATCTTCATCATACAGTCAGTG-3′
30Tg	5′-CTCGTCAGCATCTTgCATCATACAGTCAGTG-3′
30fAP	5′-CTCGTCAGCATCTfAPCATCATACAGTCAGTG-3′
30comp	5′-CACTGACTGTATGATGAAGATGCTGACGAG-3′