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Effects of concentrations of AZT, ddI, or AZT + ddI on relative survival of TK6 cells. Cultures (n = 5 per group) were exposed to 0, 33, 100, 300, or 900 μM AZT, or ddI, alone or in equimolar combinations for 3 days. Relative cell survivals were ratios of cloning efficiencies in treated versus control samples determined immediately after exposure. ●, AZT; ♦, ddI; ■, AZT + ddI; points, averages; bars, standard errors.
