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. 2000 Dec 19;97(26):14046–14051. doi: 10.1073/pnas.97.26.14046

Figure 3.

Figure 3

The number of bound Co2+ counterions per DNA base pair as a function of the divalent salt CoCl2 concentration. The counterion concentration within the isoelectric ΦDOPC = 0.6 CL-DNA complexes with CoCl2 was quantified directly by measuring the supernatant optical density at 512 nm.