6 F. Jacob, Virology, 1, 207, 1955. P. E. Hartman, in Symposium on the Chemical Basis of Heredity, ed. W. D. McElroy and B. Glass (Baltimore: Johns Hopkins Press, 1957), p. 408. 8 M. L. Morse, E. M. Lederberg, and J. Lederberg, Genetics, 41, 142, 1956. 9 M. L. Morse, E. M. Lederberg, and J. Lederberg, ibid., 41, 758, 1956. 10 A. Campbell, Virology, 4, 366, 1957. 11 W. Arber, G. Kellenberger, an...

8 Department of Virology, Beijing Institute of Microbiology and Epidemiology, Beijing 9 100071, China; State Key Laboratory of Pathogen and Biosecurity, Beijing 100071, 10 China; Novartis Institute for Tropical Diseases, Singapore; Center for Biomaterials 11 and Biopathways, Department of Chemistry, Zhejiang University, Hangzhou 310027, 12 China; State Key Laboratory of Virology, Wuhan Institut...

* This work was supported, in part, by grant G-584 of the National Science Foundation, and the Samuel S. Fels Fund. t Present address: Institute of Microbiology, Veterinary School, University of Munich, Germany. ' Wecker, E. and G. Lederhilger, these PROCEEDINGS, 52, 705 (1964). 2 Cords, C. E., and J. J. Holland, personal communication. 3 Yamamoto, N., and T. F. Anderson, Virology, 14, 430 (196...