Figure 4. Effects of aminoguanidine (0.1-1 mM) and Nomega-nitro-L-arginine methyl ester (0.01-1 mM) on the relaxation responses to electrical transmural stimulation [down tri, filled]; 3 Hz for 5 s) in gastric fundus strips isolated from rats. The rats were not treated with LPS. In the presence of atropine (1 micro Meter) and guanethidine (5 micro Meter), the strips were precontracted by prostaglandin F2alpha (1 micro Meter).