Transmission electron microscope images of Cepedea longa, to show fine structures of the nuclei and mitochondria within the endoplasm. (A) Cross section observed at low magnification, to show numerous thin bundles of microfilaments (arrow) dispersed in the endoplasm between nuclei (N) and mitochondria (M). SK = somatic kinetosomes. Scale bar = 20 μm. (B)–(D) Cross section of the nuclei (N), to show the nuclear envelope (NE) covered by a thick layer of microfibrils (arrowhead) and some unknown microtubular structures (arrow) in the nucleoplasm. NL = nucleolus. Scale bar in B = 10 μm, in C and D = 5 μm. (E) Thin section shows mitochondria having tubular cristae at periphery with an amorphic appearance. Scale bar = 5 μm.