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  • Rights: The University of Waikato, David Gregory & Debbie Marshall, Wellcome Images Published 18 October 2010 Size: 320 KB Referencing Hub media

    Bacteria cells are single-celled organisms – they can live by themselves.

    From left to right: Campylobacter bacteria; the Bacillus subtilis bacterium found in soil and the Helicobacter bacteria that is known to cause stomach ulcers.

    Helicobacter bacteria courtesy of David Gregory & Debbie Marshall, Wellcome Images

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