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Chloroplast DNA (cpDNA) variation was studied in the white oak species, Quercus robur and Quercus petraea, from Denmark, Norway, Sweden and Finland. A total of 474 trees from 91 populations were screened within the region for a set of previously characterised cpDNA haplotypes. Within the sample, haplotype 1, known to have originated from an Italian Pleistocene forest refugium, was the most common...