I am using the UBLAST tool from the USEARCH package by Edgar, and I am trying to shorten the time it takes to search for a large number of sequences in a large database. 95% of my sequences are found in a smaller subset of the database, whereas the rest needs the full database, which is much larger. So I was wondering if there is a way to print those sequences that were not found in the smaller database. After I would parse the output and ublast those reads to the larger database. Thanks