1. Baran, A., Shuster, L., Eleftheriou, B. E.: Opiate receptors and analgesic response in mice: basis for genetic difference. Fed. Proc. 34, 714 (1975)
2. Bailey, D. W.: Recombinant inbred strains. Transplantation 11, 325?327 (1971)
3. D'Amour, F. F., Smith, D. L.: A method for determining loss of pain sensation. J. Pharmacol. exp. Ther. 72, 74?79 (1941)
4. Dews, P. B.: The measurement of the influence of drugs on voluntary activity in mice. Brit. J. Pharmacol. 8, 46?48 (1953)
5. Ebel, A., Hermetet, J. C., Mandel, P.: Comparative study of acetylcholinesterase and cholineacetyltransferase activity in the brain of DBA and C57 mice. Nature New Biol. 242, 56?57 (1973)