1. Cohn, Z. A., in Mononuclear Phagocytes (edit. by van Furth, R.), 121 (Blackwell, Oxford, 1970).
2. Symp. Soc. Exp. Biol. (edit. by Miller, P.) (Cambridge University Press, London, 1968).
3. Buckley, I. K., and Porter, K. R., Protoplasma, 64, 349 (1967).
4. Ishikawa, H., Bischoff, R., and Holzer, H., J. Cell. Biol., 43, 312 (1969).
5. Schroeder, T. E., Biol. Bull., 137, 413 (1969).