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).

sort option

Order to sort the input sequences for cluster_fast. Valid values are other (the default, meaning process sequences in the order they appear in the file), length (sort by decreasing length) or size (sort by decreasing size annotation).