Comparison of the EPR spectra of a self-complementary oligonucleotide
(24-mer) containing either thymidine or [6-H-2(1)]thymidine residues f
ollowing irradiation in frozen aqueous LiCl matrices allows the unambi
guous analysis of the radical anion population in model DNA systems; t
hese studies show that C-.- (1):T-.- (2) is 85:15.