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aDepartment of Microbiology, University of Washington, Seattle, Washington
3
Present address: Department of Bacteriology, Montana State University, Missoula, Montana.
1
This investigation was supported in part by funds from the U. S. Fish and Wildlife Service and the University of Washington Fund for Biological and Medical Research.
2
Portion of a dissertation presented by the senior author as partial fulfillment of the requirements for the Ph.D. degree at the University of Washington.