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What are Pili ?...

What are Pili ?

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Pili or fimbriae are hair like appendages found on surface of cell wall of gram-negative bacteria (eg. Enterobacterium). The pili are 0.2 to 20 um long with a diameter of about 0.025um. In addition to normal pili, special type of pili which help in conjugation called sex pili are also found.
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