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pilus organisation, pilus organization and biogenesis
A process that is carried out at the cellular level which results in the assembly, arrangement of constituent parts, or disassembly of a pilus, a short filamentous structure on a bacterial cell, flagella-like in structure and generally present in many copies.
Note that this term should not be used for direct annotation. Please use one of the children, GO:0009297 ; pilus assembly or GO:0043108 ; pilus retraction.