Colored transmission electron micrograph (TEM) of a section through an Escherichia coli bacterium. These Gram-negative bacteria are present in the int


Colored transmission electron micrograph (TEM) of a section through an Escherichia coli bacterium. These Gram-negative bacteria are present in the intestinal tract of humans and other animals. They are usually harmless, but cross-contamination through food and other routes can cause diarrhoea and gastroenteritis in humans. E. coli is often used in research as a well characterised and easy to handle model organism.


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