http://en.wikipedia.org/wiki/Bacteria
In many bacteria, an S-layer of rigidly arrayed protein molecules covers the outside of the cell.This layer provides chemical and physical protection for the cell surface and can act as a macromolecular diffusion barrier. S-layers have diverse but mostly poorly understood functions, but are known to act as virulence factors inCampylobacter and contain surface enzymes in Bacillus stearothermophilus.
In many bacteria, an S-layer of rigidly arrayed protein molecules covers the outside of the cell.This layer provides chemical and physical protection for the cell surface and can act as a macromolecular diffusion barrier. S-layers have diverse but mostly poorly understood functions, but are known to act as virulence factors inCampylobacter and contain surface enzymes in Bacillus stearothermophilus.
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