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In contrast to the structural richness of the layers and appendages of the cell envelope, the interior seems relatively simple in transmission electron micrographs of thin sections of bacteria (Fig 2 – 13). There are two clearly visible regions, one granular (the cytosol) and one fibrous (the nucleoid). In addition, many bacteria possess plasmids that are usually circular, double-stranded DNA bodies in the cytosol separate from the larger nucleoid; plasmids are too small to be visible in thin sections of bacteria.
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