Figure 2.

Electronic image of a neutral unidirectional pulsed-field agarose gel for damage cluster analysis. Lanes 1–10 contain T7 DNA exposed to 0–50 Gy of 50-kVp x rays, and lanes 11–20, T7 DNA exposed to 0–10 Gy of ¹³⁷Cs γ rays. The samples are paired, with the first of each pair not treated with enzyme, and the second, treated with Fpg protein. M lanes contain molecular length standards (λ DNA and a HindIII digest of λ DNA); unirradiated T7 DNA was also used as a length standard in calculating the DNA dispersion function.