Abstract
THE nucleolus is now believed to be composed mainly of ribonucleoproteins (Caspersson1, Brachet2), although Vincent3, who succeeded in isolating large quantities of nucleoli from starfish oocytes, concluded that the bulk of the nucleolus is phosphoprotein. On the other hand, Jacobson and Webb4, like Zirkle5 before them, indicated that some nucleolar substances (ribonucleoproteins) are contributed to the chromosomes during the mitotic cycle. Doubt exists, however, as to whether it is correct to regard ribonucleic acid and proteins as the only constituents that are important. We may suspect that other nucleolar substances which are less obvious play important parts in mitosis.
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References
Caspersson, T., Symp. Soc. Exp. Biol., 1, 127 (1947).
Brachet, J., Arch. Biol., 53, 207 (1942).
Vincent, W. S., Proc. U.S. Nat. Acad. Sci., 38, 139 (1952).
Jacobson, W., and Webb, M., Exp. Cell. Res., 3, 163 (1952).
Zirkle, C., Cytologia, Tokyo, 2, 85 (1931).
Fujii, T., Annot. Zool. Japan. (in the press).
Swann, M. M., Symp. Soc. Exp. Biol., 6, 89 (1952).
Kuwada, Y., Cytologia, Tokyo, 10, 213 (1939).
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FUJII, T. Presence of Zinc in Nucleoli and its Possible Role in Mitosis. Nature 174, 1108–1109 (1954). https://doi.org/10.1038/1741108a0
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DOI: https://doi.org/10.1038/1741108a0
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