Activation of mu, delta or kappa opioid receptors by DAMGO, DPDPE, U-50488 or U-69593 respectively causes antinociception in the formalin test in the naked mole-rat (Heterocephalus glaber). Towett, P. K., Kanui, T. I., Maloiy, G. M. O., Juma, F., & Olongida Ole Miaron, J. Pharmacology Biochemistry and Behavior, 91(4):566–572, 2009.
Activation of mu, delta or kappa opioid receptors by DAMGO, DPDPE, U-50488 or U-69593 respectively causes antinociception in the formalin test in the naked mole-rat (Heterocephalus glaber) [link]Paper  bibtex   

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