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That study indicates the presence of only one substitution (0.15%) in the entire barcode portion of the COI.
The barcode portion of the SL design allows a unique barcode to be ligated to each of the different sample amplification test sets so that they can be pooled for high throughput sequencing.
For libraries that were barcoded (experiments 2 and 3) and often had mismatches in the barcode portion of the read, a custom Perl script was used to assign a barcode to a library only if 1) the barcode had the fewest mismatches compared to any other barcode, and 2) no more than three mismatches total were found [ 37].
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However, one limitation of this approach is that the adaptor, barcode and mapped portion of the read occupies ∼31 nt, and so long A-tails (>∼15 nt) are underrepresented.
Although COI barcodes (a standardized portion of the mitochondrial cytochrome c oxidase subunit I gene) can distinguish some members of this genus, the evolutionary relationships of the three morphospecies Dendrolimus punctatus, D. tabulaeformis and D. spectabilis have remained largely unresolved.
The barcode portion was created by PCR amplification using a 200 bp portion of the human IgG C-kappa domain as the template to serve as the filler sequence.
Once a barcode was identified, both the adapter with the barcode, and the following "GGG" portion of the adapter was removed before alignment.
The company identification assigned by GS1 is only a portion of the barcode.
At the recent Barcode Conference in Mexico City, it was reported that a significant portion of the ITS2 GenBank records from plants are likely to represent fungal sequences from endophytes.
Lahaye et al. [18] analyzed 1084 plant species (nearly 96% orchid species) and demonstrated that a portion of the plastid matK gene could be a universal DNA barcode for flowering plants.
A combination of the non-coding trnH-psbA spacer region and a portion of the coding rbcL gene is recommended as a two-locus global land plant barcode that provides the necessary universality and species discrimination.
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