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Six Meloidogyne incognita isolates with previously characterized genetic relationships were used to test the utility of a 63 base-pair mitochondrial Variable Number Tandem Repeat (VNTR) as a marker for population studies. The polymerase chain reaction (PCR) was used to amplify this locus and to measure copy number and allele frequencies of the 63 bp VNTR. Individual nematodes were typically heteroplasmic...
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