1. Bergström, S., Science, 157, 382 (1967).
2. Von Euler, U. S., Clin. Pharmacol. Ther., 9, 222 (1968).
3. Van Dorp, D. A., Burthuis, R. K., Nugtern, D. H., and Vonkeman, H., Biochim. Biophys. Acta, 90, 204 (1964).
4. Sanner, J., Rozek, L., and Cammarata, P., in Prostaglandin Symposium of the Worcester Foundation for Experimental Biology (edit. by Ramwell, P. W., and Shaw, J. E.), 215 (Interscience, New York, 1967).
5. Bergström, S., Krabisch, L., Samuelsson, B., and Sjovall, J., Acta Chem. Scand., 16, 969 (1962).