If you observe rod shaped, pink cells on a slide that had just been gram stained, you can assume that their cell walls contain endotoxin.04.13 Summarize how gram-positive and gram-negative cells differ in their reactions.

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Gram-negative bacteria, which appear pink after Gram staining, have an outer membrane containing lipopolysaccharides, which include endotoxins.

If You Observe Rod Shaped, Pink Cells on a Slide