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Proteobacteria
The
Proteobacteria
are a major group (
phylum
) of
gram-negative bacteria
. They include a wide variety of
pathogens
, such as
Escherichia
,
Salmonella
,
Vibrio
,
Helicobacter
, and
Yersinia
, and many other notable
genera
. Others are free-living (non
parasitic
), and include many of the
bacteria
responsible for
nitrogen fixation
.
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