Figure 3. Serum and Testicular Zn concentrations following sleep deprivation and treatment with RibCys and/or Zn.At p<0.05 level, a indicates significant differences compared with PSD, PSD+RibCys, PSD+Zn, PSD+RibCys+Zn and Control while b indicates a significant difference from Control. PSD=Paradoxical sleep deprivation, RibCys=Riboceine, Zn=Zinc.