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Fig. 1. Xenopus oocyte nuclei contain an extensive filamentous network associated with spherical bodies, a subset of which is recognized by antibodies specific for coilin. (A-E) Nuclear contents fixed and visualized by scanning electron microscopy (feSEM) after `peeling' away the nuclear envelope (A,B) and then applying either moderate (C) or strong (E) manual `spreading' forces. (D) Imaging by field emission electron microscopy (feSEM) of a gently opened oocyte nucleus; the folded-back nuclear envelope is visible at left, and intranuclear filaments associated with spherical bodies are seen at right. (F) Quantification of the diameters of spherical bodies (n=212 bodies). (G) Western blot of isolated Xenopus oocyte nuclei probed with anti-coilin antibodies. (H,I) Representative feSEM images of spherical bodies, fixed and labeled with anti-coilin antibodies (H) or no primary antibody (I), followed by incubation with secondary antibodies conjugated to 10 nm gold-particles (pseudo-colored yellow).