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Transmission electron micrograph of high-pressure frozen and cryosubstituted cell of Chthoniobacter flavus, showing paryphoplasm (P) and an intracytoplasmic membrane (ICM) enclosing a pirellulosome region containing a condensed fibrillar nucleoid (N) which surrounds an electron-dense granule. Inset – enlarged view of region of cell outlined in the white box showing cytoplasmic membrane (CM), paryphoplasm (P) and intracytoplasmic membrane (ICM). Bar – 200 nm.
