B. Arithmetic means (n=5) of percentages of Annexin V+ PI- leukocytes recruited to spleens of mice, which were left untreated (control, white bars) or fed with grain maize derived from 20 mg/kg dry weight (DW) or 1000 mg/kg DW nCu-treated seeds (black bars) or treated with nCu at dose of 2 mg/l or 1000 mg/l (grey bars). * (P<0.05) represents significant difference from control group, ANOVA