Sequence motifs at systematic error sites. (a) The motif around systematic errors reveals a strong enrichment for instances preceded by an occurrence of GG and for the error to occur at locations where the reference genome is T. (b) Categorized by the nucleotide at the error location. The number of systematic errors in each subset is denoted by n.
Meacham et al. BMC Bioinformatics 2011 12:451 doi:10.1186/1471-2105-12-451