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(1) Gram-negative indicates a group of bacteria that become red when the
bacterial cells are treated using the Gram stain method. This response
is based on the chemical and physical properties of their cell walls
and is used to identify the type of bacteria. Some Gram-negative
bacteria may cause serious infections.
(2) Gram-positive indicates a group of bacteria that become blue when the
bacterial cells are treated with the Gram stain. This response is
based on the chemical and physical properties of their cell walls and
is used to identify the type of bacteria. Some Gram-positive bacteria
may cause serious infections.
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