NUCLEO-CYTOPLASMIC RELATIONS IN SALIVARY-GLAND CELLS OF Drosophila

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Abstract
Electron micrographs of serial sections of functionally active salivary-gland cells of third-instar larvae of D. melanogaster have revealed that highly electron-scattering chromosomal materials are associated with outpocketings of the nuclear membrane. It is suggested that these blebs may become detached and released into the cytosome where they contribute to the formation of such cytoplasmic structures as endoplasmic reticulum and secretion granules. Whether or not this is a specific mechanism for one type of cell in a particular stage of development remains to be determined.