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Stalked bacteria of the genus Caulobacter from stagnant tap water. The bacteria develop the stalk (which is attached to a particle or biofilm) during starvation (phosphate limitation). Its length grows with the the age of the cell. The stalk of the cell in the middle is more than 100 ┬Ám long (Picture: 100x obj., 10x eyepiece, phase contrast after staining with methylene blue)

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