Mothur is a comprehensive suite of tools for microbial ecology community. It is initiated by Dr. Patrick Schloss and his software development team in the Department of Microbiology and Immunology at The University of Michigan. For more information, see Mothur-Wiki.
The remove.otulabels command removes otu labels from the output from classify.otu, corr.axes and otu.association. This can be useful especially with subsampled datasets or when groups have been selected.