Table 1. Effects of Various Receptor Antagonists on N2O-induced Antinociceptive Effect by the Plantar Test
*P < 0.05 vs. 75% N2O/saline group among N2O exposed groups;
†P < 0.05 vs. air/saline group.
% MPE = percent of maximum possible effect; i.p. = intraperitoneal injection.