So I have noticed some incorrect assignment in MEGAN6 output. Allot of the alignment in the megan file could not be assigned to a taxonomy. The UBLAST was done using a 2015 nr datbase. I checked the accession in the alignment and it seemed that accession belonging to certain taxa changed (replaced) in the last year due to the updates NCBI did to the nr database. So I am wondering if it would be possible to provide me with the old mapping file ( dated before 2016).