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A phylum of bacteria, composed of five classes.
A phylum of bacteria, composed of five classes.
Class '''Alphaproteobacteria''', orders Rhizobiales and Rickettsiales.
Class '''Alphaproteobacteria''', order Rhizobiales (families Bartonellaceae and Brucellaceae) and order Rickettsiales (families Anaplasmataceae and Rickettsiaceae).
Class '''Betaproteobacteria''', orders Burkholderiales and Neisseriales.
Class '''Betaproteobacteria''', orders Burkholderiales and Neisseriales.