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Hyphomicrobium A genus of bacteria which are not assigned to any taxonomic family. The cells are variable in shape (spindle-shaped, egg-shaped, bean-shaped, etc.), and develop thread-like extensions which may branch. From the tips of these extensions, motile (flagellated) cells are produced by budding; these subsequently become attached to a substrate, lose motility, and develop thread-like extensions, thus completing the cycle. These bacteria are chemo-organotrophs, which grow aerobically or anaerobically in the presence of nitrate. They are found in soil and water.