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Experimental design. RS, restraint stress; PWMT, paw withdrawal mechanical threshold; PWTL, paw withdrawal thermal latency; TFL, tail-flick latency; BH4, tetrahydrobiopterin; L-NAME, Nω-nitro-L-arginine methyl ester; DAHP, 2,4-diamino-6-hydroxypyrimidine; 7-NI, 7-nitro indazole; 1400W, N-([3-(aminomethyl)phenyl]methyl)ethanimidamide.
