1. Koe, K., and Weissman, A., J. Pharmacol. Exp. Ther., 154, 499 (1966).
2. Jouvet, M., Science, 163, 32 (1969).
3. Conner, R., Stolk, J., Barchas, J., and Levine, S., Physiol. Behav., 5, 1215 (1970).
4. Jequier, E., Lovenberg, W., and Sjoerdsma, A., Mol. Pharmacol., 3, 274 (1967).
5. Ichiyama, A., Nakamura, S., Nishizuka, Y., and Hayaishi, O., Biol. Chem., 245, 1699 (1970).