Fine-structure images of ooplasm. (A and B) EM of a stage 10B egg chamber with an entering NC nucleus showing the oocyte at low magnification (A) and a montage of high-magnification images (B) showing the ooplasm devoid of membrane between the entering NC nucleus at the anterior and plasma oocyte membrane juxtaposed to vitelline membrane at the posterior pole. (C and D) Fine structure of the nuclear membrane of the entering NC (C) and oocyte plasma membrane (D). Scale bars: 20 µm (A and B); 5 µm (C and D).