The α-proteobacteria or Alphaproteobacteria is the most abundant variety of bacteria, the γ-proteobacteria or Gammaproteobacteria is the largest bacterial class with several groups of branches. Gammaproteobacteria are grouped into two rRNA superfamilies, Enterobacteriaceae, Vibrionaceae, and Pasteurellaceae belong to rRNA superfamily I; while Pseudomonas, Moraxella, Azotobacter, and Acinetobacter belong to rRNA superfamily II.

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Chapter 22.3, Problem 3CC

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The α-proteobacteria or Alphaproteobacteria is the most abundant variety of bacteria, the γ-proteobacteria or Gammaproteobacteria is the largest bacterial class with several groups of branches. Gammaproteobacteria are grouped into two rRNA superfamilies, Enterobacteriaceae, Vibrionaceae, and Pasteurellaceae belong to rRNA superfamily I; while Pseudomonas, Moraxella, Azotobacter, and Acinetobacter belong to rRNA superfamily II.

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