Figure 8.

Tomographic study of one crescent-shaped NOR. Ninety-nine coronal tomographic slices 6 nm thick are systematically performed along the reconstructed volume of the crescent- shaped NOR. For simplicity, one section of two is shown from sections 20 to 82. These views demonstrate the presence of contorted fibers 60–80 nm in diameter within the full volume of the structure (see, for example, arrowheads on sections 30, 42, and 56). One can note that numerous dark zones without silver are frequent (sections 42 and 56, arrows). Bar, 100 nm.