. The biological role of ribonucleic acids. RNA; Biosynthesis. 110 ROLE OF THE CELL NUCLEUS. Fig. 33. High incorporation of labeled COo into nuclei of amphibian gastrula (autoradiograph by Dr. A. Ficq).. 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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