RNA IN NORMAL AMPHIBIAN EGGS 



63 



Fig. 22. RNA gradients in Xenupiis late gastrula. Note tiie more intensive baso- 

 philia of the dorsal lip (right) as compared to the ventral one (Brachet, 1957). 



Fig. 23. Dorso-ventral RNA gradients in neurectoderm and chordomesoderm 

 in young neurula of Xenopns (Brachet 1957). 



