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Purple bacteria
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Purple bacteria or purple photosynthetic bacteria are Gram-negative proteobacteria that are phototrophic, capable of producing their own food via photosynthesis.
Wikipedia
Representative species
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Rhodobacter
Rhodopseudomonas palustris
Rhodospirillum
Rhodobium
Chromatium okenii
Blastochloris viridis
Rhodomicrobium
Rhodoferax