Cross Section of <I>Shigella flexneri</I> (IMAGE)
Caption
You can clearly see the two membranes (orange) enclosing the cell interior (blue) and the needles protruding to the outside (orange, marked in blue). The bar corresponds to a micrometer or a thousandth millimeter, respectively.
Credit
Ulrike Abu Abed, Diane Schad, and Michael Kolbe
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