1. Dougherty, T. F. Physiol. Rev., 32, 379 (1952).
2. Pierpaoli, W., Fabris, N., and Sorkin, E., in Cellular Interactions in the Immune Response (2nd Convocation of Immunology, Buffalo, New York, 1970), 25 (Karger, Basel, 1971).
3. Arrenbrecht, S., and Sorkin, E., Eur. J. Immun., 3, 601 (1973).
4. McManus, J. P., and Whitfield, J. F., Proc. Soc. exp. Biol Med., 132, 409 (1969).
5. Pandian, M. R., and Talwar, G. P., J. exp. Med., 134, 1095 (1971).