percentage
Figure 3: A comparative analysis of percentage of apoptotic sperm cells in three groups: TdT (terminal deoxynucleotidyl transferase)-mediated dUTP nick-end labeling (TUNEL) assay of spermatozoa. The apoptotic sperm cells were identified with deep brown colour (1) and the normal cells were stained light green (2) (under bright field, 40x). Percentage of apoptotic sperm cells observed in A. non-smokers B. tobacco smokers and C. cannabis smokers. A graph showing percentage of apoptotic sperm cells in three different groups of subjects. Scale bar=50 μm.