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Histamine levels after in vitro stimulation with vehicle, substance P (3×10−5 M), or GR 73632 (1×10−6 M) in colonic samples from control or stressed female rats. Values are mean (SEM), n=8. *p<0.05, **p<0.01, significantly different from vehicle values; ††p<0.01, significantly different from control values; ‡‡p<0.01, significantly different from control SP value.
