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AZT-DNA incorporation in TK6 cells. Cultures (n = 5 per group) were exposed 0, 33, or 100 μM AZT, alone or in equimolar combinations with ddI for 3 days. After exposure genomic DNA was extracted and assayed by AZT-RIA for incorporation into DNA. AZT, empty bar; AZT + ddI, black bar.
