Merging OTU's

Hi,

Is it possible to merge OTU’s by providing a file that says which OTU’s should merge together, rather than moving to a higher similarity cutoff? I took all my rep.OTU and did a blast search and found that for a few OTU’s the best blast hit is identical, only the bit scores drop slightly. I am assuming that the different rep.OTU with the same best blast match are infact the same, but they form two different OTU’s due to sequencing errors.

Thanks very much,
Ameet

Hmmm, not currently.