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    Gram-negative bacteria are a type of microscopic organisms that have a specific cell structure characterized by a thin peptidoglycan layer in their cell wall. This thin layer is surrounded by an outer membrane, which contains lipopolysaccharides (LPS) and porins. Gram-negative bacteria stain pink or red when subjected to the Gram staining method, a common laboratory technique used to differentiate bacteria based on their cell wall composition. Examples of gram-negative bacteria include Escherichia coli (E. coli), Salmonella, and Pseudomonas aeruginosa. They are found in various environments, including soil, water, and the human body, and some can cause infections in humans and animals.

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