The domain of bacteria that includes most ordinary bacteria and lives in soil, water, and organisms like humans.
From Greek 'eu-' (true, proper) + 'bacteria' (plural of bacterium); distinguishes 'true' bacteria from archaebacteria discovered later.
Your gut contains roughly the same number of eubacteria as you have cells in your entire body—they outnumber your own cells three to one and essentially run your immune system!
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