Make an OTU abundance table
From Ribosomal Database Project Wiki
An OTU table contains abundance data of each OTU from each sample (or library). It is a commonly used data matrix input for statistics analysis using packages such as R.
OTU tables can be made through:
1. Use Clustering tool to first generating .clust file with 'cluster' command on the distance matrix and then run 'cluster_to_Rformat'
command to convert it to OTU table in tab-delimited or BIOM format. 2. Use Classifier to classify the representative sequence of each OTU and use it to replace its OTU identifier in the OTU table (BIOM format).