meaning of ambiguous taxonomic labels in Greengenes

Hi @Ishanmanandhar,
Please see this topic for more details about what those different labels mean:

I would filter this one but not the others (there is some discussion elsewhere on this forum regarding motivations for this):

Probably uncultivated/unknown clades of bacteria, but that nomenclature is specific to the reference database and is not coming from QIIME 2, so you should contact the authors of those databases for more details on their nomenclature.

Good luck!

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