Single cell gel electrophoresis of human lymphocytes showing comets after treatment with the increasing concentrations of N-OH-AABP; (A) untreated, (B) treated with 0.378 mM N-OH-AABP, (C) with 0.757 mM N-OH-AABP, (D) with 1.136 mM N-OH-AABP, (E) with 1.515 mM N-OH-AABP.