Filamentous bacteriophages are a family of viruses (Inoviridae) that infect bacteria, or bacteriophages. They are named for their filamentous shape, a worm-like chain (long, thin, and flexible, reminiscent of a length of cooked spaghetti), about 6 nm in diameter and about 1000-2000 nm long.[1][2][3][4][5] This distinctive shape reflects their method of replication: the coat of the virion comprises five types of viral protein, which are located in the inner membrane of the host bacterium during phage assembly, and these proteins are added to the nascent virion's DNA as it is extruded through the membrane. The simplicity of filamentous phages makes them an appealing model organism for research in molecular biology, and they have also shown promise as tools in nanotechnology and immunology.
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^Rakonjac J, Russel M, Khanum S, Brooke SJ, Rajič M (2017). "Filamentous Phage: Structure and Biology". In Lim TS (ed.). Recombinant Antibodies for Infectious Diseases. Advances in Experimental Medicine and Biology. Vol. 1053. Springer International Publishing. pp. 1–20. doi:10.1007/978-3-319-72077-7_1. ISBN978-3-319-72076-0. PMID29549632.