taken together , the results suggest ( a ) that mu- , and possibly delta- , opioid receptors can mediate supraspinal inhibition of colonic bead expulsion in mice and ( b ) that the genetic deficits of mu-receptor number or genetically-induced alteration in receptor function in cxbk mice do not equally affect inhibition of colonic bead expulsion and tail-flick antinociception .
C0034801
opioid receptors
C0066908
mu-receptor