Video talks on 16S data analysis posted.

URMAP ultra-fast read mapper posted (paper).

~20% of taxonomy annotations in SILVA and Greengenes are wrong (paper).

Taxonomy prediction is <50% accurate for 16S V4 sequences (paper).

97% OTU threshold is wrong for species, should be 99% for full-length 16S, 100% V4 (paper).

-dbmask option

Specifies masking for database sequences. Default is fastnucleo or fastamino. In the case of a udb database, masking is applied when the index is created (makeudb_ublast or makeudb_usearch); the -dbmask option will be ignored by search commands that use a udb database.