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I'm not an expert on Bacteria. I just stumbled over a number of article in which filamentous growth appear to be normal, and actually help the bacteria to avoid predation by larger, phagocitouos protists. Thus it might need some serious rewriting.
Hahn MW, Höfle MG (1998) Grazing Pressure by a bacterivorous flagellate reverses the relative abundance of Comamonas acidovorans PX54 and Vibrio strain CB5 in chemostat cocultures. Applied and Environmental Microbiology 64: 1910-1918.
Hahn MW, Moore ERB, Höfle MG (1999) Bacterial filament formation, a defense mechanism against flagellate grazing, is growth rate controlled in bacteria of different phyla. Applied and Environmental Microbiology 65: 25-35. — Preceding unsigned comment added by Kunadam (talk • contribs) 21:58, 2 January 2014 (UTC)