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Figure 2 :Effect of combined administration of L-NNA and L-arginine or D-arginine on 1-PBG-induced intraluminal fl uid transport. Results are expressed as mean S.E.M. (n = 6). A negative value represents net absorption and positive value represents net secretion. ***P < 0.01, **P < 0.001 vs. 1-PBG; *P < 0.01 vs. 1-PBG + L-NNA

Figure 2 :Effect of combined administration of L-NNA and L-arginine or D-arginine on 1-PBG-induced intraluminal fl uid transport. Results are expressed as mean  S.E.M. (n = 6). A negative value represents net absorption and positive value represents net secretion. ***P < 0.01, **P < 0.001 vs. 1-PBG; *P < 0.01 vs. 1-PBG + L-NNA