RNA IN NORMAL AMPHIBIAN EGGS 



61 



big. 18. Swollen interphase nuclei in ribonucleasc-treated amphibian morula. 

 (Brachet and Ledoux, 1955) 



Fig. 19. Large neural tube induced after implantation of tobacco mosaic virus 

 into the blastocoele cavity of an axolotl gastrula (Brachet, 1950). 



References p. 90/93 



