<sod>}}</ref>. This study also indicated that differences in tetranucleotide usage patterns can be used to identify genes (or metagenomic reads) originating from specific habitats. Additionally some methods as TriageTools<ref name="Fimereli2013"/> or Compareads<ref name="Maillet2013"/> detect similar reads between two read sets. The similarity measure they apply on reads is based on a number of identical words of length ''k'' shared by pairs of reads.<eod>
<sod>}}</ref>. This latter study also indicated that differences in tetranucleotide usage patterns can be used to identify genes (or metagenomic reads) originating from specific habitats. Additionally some methods as TriageTools<ref name="Fimereli2013"/> or Compareads<ref name="Maillet2013"/> detect similar reads between two read sets. The similarity measure they apply on reads is based on a number of identical words of length ''k'' shared by pairs of reads.<eod>