Make an OTU abundance table

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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).

The OTU table (tab-delimited format) can be imported to R for further analyses with contextual environmental variables using Phyloseq and RDPutils (see tutorials).

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