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The rbcL and matK regions have been proposed as the "core barcode" for plants and the ITS2 and psbA-trnH intergenic spacer (PTIGS) regions were later added as supplemental barcodes. ... DNA barcoding technology, which uses a short piece of DNA sequence to identify species, has wide ranges of applications. Until today, a universal DNA barcode marker for plants remains elusive. ... The psbA-trnH intergenic spacer (PTIGS) region has been successfully used to resolve problems in species identification in a number of studies [3,     . ...doi:10.1186/1471-2105-12-s13-s4 pmid:22373238 pmcid:PMC3278844 fatcat:flrkdjsrwjanfakudk7y2gqd3u