Example data for the first 50 positions of a metagenomic dataset containing tag sequences. Example data showing nucleotide frequencies (top), predicted tag sequence (middle), and frequency range and median (bottom) for the first 50 positions in a metagenomic dataset before tag trimming. We can see a clear separation between the non-random nucleotide positions of the tag (A), the quasi-random nucleotides of the tag (B) and the metagenomic sequence (C).
Schmieder et al. BMC Bioinformatics 2010 11:341 doi:10.1186/1471-2105-11-341