Abstract
True accessory nuclei with the characteristic “double” membrane structure have been observed in the oocytes of the dipterans (Nematocera) Phryne cincta and P. fenestralis. They seem to arise from proliferations of the nuclear membrane. Although they often cling to the nucleus after their formation, they differ from it in certain structural details; their inner membranes are less electron-dense, and they have a greater frequency of pores.
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Meyer, G.F., Sokoloff, S., Wolf, B.E. et al. Accessory nuclei (nuclear membrane balloons) in the oocytes of the dipteran Phryne . Chromosoma 75, 89–99 (1979). https://doi.org/10.1007/BF00330627
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DOI: https://doi.org/10.1007/BF00330627