1. H. U. Keller, Immunology10, 225 (1966).
2. S. H. Zigmond and J. H. Hirsch, J. expl Med.137, 387 (1973).
3. P. C. Wilkinson, Expl Cell Res.103, 415 (1976).
4. H. U. Keller, J. Wissler, M. W. Hess and H. Cottier, in: Movement, metabolism and bactericidal mechanisms of phagocytes. Piccin, Padova (in press).
5. H. U. Keller, J. H. Wissler, M. W. Hess and H. Cottier, submitted for publication.