Summary
The nucleolus of the salivary gland nucleus of Drosophila melanogaster is formed by nucleolus-organizing regions which exist in the heterochromatin of the sex chromosomes. This interpretation is supported by the discovery of a series of induced chromosomal alterations involving transfer of nucleolus-forming regions to euchromatic sections of the chromosomes.
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Kaufmann, B.P. Nucleolus-organizing regions in salivary gland chromosomes of Drosophila melanogaster. Z. Zellforsch. 28, 1–11 (1938). https://doi.org/10.1007/BF00368209
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DOI: https://doi.org/10.1007/BF00368209