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Fig. 18. Tissue culture preparation of frog adenocarcinoma with cytoplastic inclusion 

 and tabulated nucleus. (Courtesy Dr. W. Duryee.) 



Fig. 19. Thin section of frog adenocarcinoma showing mature virus particles within 

 cytoplasmic vesicles. Complex structure of mature virus particles apparent. (Courtesy 

 Dr. D. Fawcett, 1956.) 



