. The biological role of ribonucleic acids. RNA; Biosynthesis. EXPERIMENTAL MODIFICATIONS 73. Fig. 26. Dorsal lip of frog gastrula irreversibly blocked after a heat shock (Brachet, 1957). References p. 90/93. 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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