. The biological role of ribonucleic acids. RNA; Biosynthesis. 76 GROWTH AND MORPHOGENESIS. Fig. 31. Ectodermless embryo after treatment of a young gastrula with a mix- ture of ribonuclease and versene. A chorda has differentiated but the ectoderm cells are blocked and cytolysing (Brachet, 1959).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brachet, J. (Jean), 1909-. Amsterdam, New York, Elsevier Pub. Co.

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