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Dividing cell of Methanogenium marisnigri prepared by freeze-etching.
Note the surface layer (S layer) and several flagella. Bar: 0.5 µm.
(From Romesser, J.A., Wolfe, R.S., Mayer, F., Spiess, E., Walther-Mauruschat, A., 1979, Arch. Microbiol. 121, 147-154).

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