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Endogenous opioid and substance P (SP) expression in the spinal cord of rats exposed to stress. A, There were no significant differences in endomorphin-2 expression between groups (n = 10-12 ± standard error of the mean [SEM]). B, Regardless of stress endometriosis by itself tended to increase enkephalin expression in the endo animals compared to the sham-no stress animals (n = 10-12 ± SEM). C, There were no significant differences between groups (n = 10-12 ± SEM).
