Figure 5 . Lines are logarithmic linear least squares fits. Figure 6 . Lines are linear least squares fits. Figure 7 .
Lines are linear least squares fits.
Figure 8 . This line is fit by a 2-point running average. 0 can be estimated from Figure 1. On average for the various oxygen tensions and for both complexes, IC 50 's occur when one ruthenium is coordinated per 1000-2000 DNA base pairs. This work was supported by NIH Grant GM26390 and a Research Incentive Grant from Boston College.