. The biological role of ribonucleic acids. RNA; Biosynthesis. Fig. 20. RNA gradient in fertilized A'£'//c»/7W5'egg(Brachet, 1957).. S- ^ .¥ .i"^ Fig. 21. RNA gradient in Xenupus blastula (Brachet, 1957).. 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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