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A thin filament that extends from the surface of a microorganism and functions to facilitate the adhesion of the cell to other cells or to the substratum. Fimbriae occur in large numbers on a given cell, and they are not to be confused with conjugative pili. Fimbriae occur on Gram- negative bacteria and certain fungi. Each fimbria consists of linear repeating molecules of a protein called fimbrillin. See P blood group, pilus.

Subjects: Genetics and Genomics.

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