I have demultiplexed paired-end sequences where the nifH gene (samples collected from a freshwater system) was amplified using the Ando primer set (IGK3/DW ; Forward/Reverse primers), but I'm not familiar with a nifH taxonomic database that's compatible with QIIME2.
In a previous post (Suggestions for using nifH ARB database for taxonomy assignment in QIIME2), it was mentioned that @EGvibrio had made a custom database, but beyond that I'm not familiar with any other...
If anyone knows of such a database and/or knows how to get in touch with @EGvibrio I would greatly appreciate it. Thank you!!!