Hi @Bing_Guo!
You'll need to import the Greengenes reference sequences and taxonomy map into two artifacts (.qza
files) before using them in QIIME 2. The feature-classifier tutorial shows how to import these files using the 85% Greengenes files. The process should be the same for the 97% files as well.
Specifically, you'll need to supply --source-format HeaderlessTSVTaxonomyFormat
when importing the Greengenes taxonomy file.
@Nicholas_Bokulich do you have any comments on this?