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).

sortedby option

Sort order (length, size, other) of input sequences for cluster_smallmem. This indicates that the sequences have already been sorted in the given order, cluster_smallmem does not perform a sort (unlike cluster_fast, which can perform a sort if required).