"Россия, дубликаты Лютеранских метрических книг, 1833-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q242-XRVT : 8 March 2021), Catharina Krein, 24 Sep 1843, Baptism; citing p. 111, volume 828-14/38, Bergdorf, Izmail, Bessarabia, Russia, Russland Historischen Staatsarchiv, St. Petersburg (Russian State Historical Archive, St. Petersburg); FHL microfilm 1,882,594.
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It may be possible to confirm family relationships with Katharina by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Katharina: