KLC3 and Infertility: Based on this result, the correlation between sperm concentration with relative KLC3 expression was carried out in both fertile (r= 0.24, p= 0.33) and infertile groups (r= 0.45, p= 0.00), which revealed a positive correlation between these two parameters in both fertile and infertile individuals, that was significant only for infertile group (Figure 4).