Figure 1
From: Sperm DNA fragmentation and oxidation are independent of malondialdheyde
TdT (terminal deoxynucleotidyltransferase)-mediated dUTP nick-end labeling (TUNEL) assay of spermatozoa. Histograms show: (A) negative control with 1.35% TUNEL positive cells. (B) Positive control (spermatozoa treated with DNaseI) with 90.2% TUNEL positive cells. (C) Semen sample of one patient with 21.4% TUNEL positive cells. M: window adjusted to detect the percentage of TUNEL positive cells.