. The biological role of ribonucleic acids. RNA; Biosynthesis. 122 ROLE OF THE CELL NUCLEUS W. Fig. 38. Nucleus and nucleolus of normal Acetahuhiiia. Unna staining (Brachet et ai, 1955).. 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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