Ψ
 Medical Concepts
  Organisms
 Bacteria
 Proteobacteria
 Betaproteobacteria
 Alcaligenaceae
 Burkholderiaceae
 Comamonadaceae
 Gallionellaceae
 Hydrogenophilaceae
 Methylophilaceae
 Neisseriaceae
 Nitrosomonadaceae
 Oxalobacteraceae
 Rhodocyclaceae
 Spirillaceae

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