Figure 7: DNase degradation times for the complexes formed between foreign DNA and DEAE-dextran-MMA graft copolymer or DEAE-dextran, respectively. DNase I degrades both double-stranded and single-stranded DNA endonucleolytically, producing 3-OH oligonucleotides. Toluidine blue (TB) was isolated from the water after degradation, as the DNA was stained with TB. This graph shows the absorbance of the TB isolated from the DNA in each sample measured with a spectrophotometer.