Fig 1(a) from
the UPARSE paper.
segments in the pie chart show the fraction of chimeric OTUs generated by
several algorithms on a mock community test. The QIIME and mothur pipelines used
UCHIME for chimera detection. Notice that even after UCHIME filtering, about 50%
of the OTUs generated by QIIME and mothur are chimeric, while UPARSE
successfully filters all chimeras from Illumina reads and leaves only one
chimeric OTU with 454 reads.