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DNA Connections
It may be possible to confirm family relationships by comparing test results with Klaas or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Klaas Jansen:
Family Tree DNA Y-DNA Test 67 markers, haplogroup R-P312, FTDNA kit #104513, MitoYDNA ID T18664[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Klaas Jansen:
Family Tree DNA mtDNA Test Full Sequence, haplogroup H1g1, FTDNA kit #104513