. The biological role of ribonucleic acids. RNA; Biosynthesis. 90 GROWTH AND MORPHOGENESIS between the nuclei and the cytoplasm occur and that these inter- actions are linked to the existence of the cytoplasmic RNA gra- dients. The latter thus appear, once more, as extremely important factors in 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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