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ESI-mass spectra showing solutions containing the single strand d(GCGGATATATGGCG) (ss1) (a) before reaction with KMnO4, (b) after 4 min. reaction with KMnO4, and (c) after 30 min. reaction with KMnO4. Spectral enlargements of the region around m/z 1070 to 1115 are shown in the inset. Sodium adducts are labeled with an asterisk. Ions containing oxidized thymines are labeled with ▼, with the number in parenthesis indicating the number of oxidation adducts.
