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1Section of Virology and Electron Microscopy, The University of Texas M. D. Anderson Hospital and Tumor Institute, and Department of Microbiology, Baylor University College of Medicine, Texas Medical Center, Houston, Texas
1Section of Virology and Electron Microscopy, The University of Texas M. D. Anderson Hospital and Tumor Institute, and Department of Microbiology, Baylor University College of Medicine, Texas Medical Center, Houston, Texas
1
Preparation of this paper was aided by Research Grants from the National Cancer Institute of the National Institutes of Health, U. S. Public Health Service, and from the American Cancer Society.