''Microvirgula'' is a

Gram-negative Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteristic is that their cell envelope consists ...

bacteria genus from the family of Neisseriaceae. Up to now there is only one species of this genus known ( Microvirgula aerodenitrificans).

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Further reading