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1Laboratories of Bacteriology, Department of Biological Sciences, Purdue University, West Lafayette, Indiana
2
The Rockefeller Foundation and the Office of Naval Research supported the initial phases of this work; since 1954 we have received a grant from the U. S. Public Health Service. I am also indebted to former and present associates who shared in this work.
1
Eli Lilly and Company Award address in Bacteriology and Immunology. Presented at the Fifty-seventh Annual Meeting of the Society of American Bacteriologists in Detroit, Michigan, on May 1, 1957.