Abstract
IN many animals during the second period of growth of the oocyte there is a production of nucleolar substance by means of a multiplication of numerous little nucleoli, or the budding of small nucleoli from a principal nucleolus1. When a principal nucleolus exists, in general concomitantly with the production of the buds, some inclusions with a more or less vacuolar appearance are formed in its interior1. In a study of the nucleolar physiology in two species of Helicidæ—Helix aspersa Müll, and Tachea nemoralis L.—we have examined the constitution of these inclusions. They are not aqueous vacuoles; though they can be, and probably in general are, less dense than the body of the nucleolus; when centrifuged they are not markedly dislocated and in concentrated salt solutions the volume of the inclusions does not diminish more than the rest of the nucleolus.
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References
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SERRA, J., LOPES, A. Chemical Constitution of the Nucleolar Inclusions in Growing Oocyte Cells. Nature 155, 792 (1945). https://doi.org/10.1038/155792b0
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DOI: https://doi.org/10.1038/155792b0
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