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1Mouse Pox Service Laboratory, Department of Microbiology, Hahnemann Medical College, Philadelphia, Pennsylvania
2
Present address: Department of Microbiology, Seton Hall College of Medicine and Dentistry, Jersey City, New Jersey.
1
The operation of the Mouse Pox Service Laboratory and the experimental work were made possible by Contract No. SA-43-ph-1875 with the Cancer Chemotherapy National Service Center, National Cancer Institute, National Institutes of Health.