(C) Effects of NAT on corticosterone concentrations in the serum of mice (Slc:ddY, 9-10 wks old, male) exposed to restraint stress for 60 min (data are means ± SEM; n=6). ** P<0.01 vs. without stress. Test mice drank 1.5 mg/ml NAT solution for 24 h before exposure to stress. 