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Gram Negative Bacterium
Gram-negative bacteria are those that do not retain crystal violet
dye in the Gram staining protocol. Gram-positive bacteria will retain
the dark blue dye after an alcohol wash, whereas Gram-negative do not.
In a Gram stain test, a counterstain is added after the crystal violet,
which colors all Gram-negative bacteria a red or pink color. The test
itself is useful in classifying two distinctly different types of
bacteria based on structural differences in their cell walls.
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