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Pairwise genetic distance for chloroplast DNA of Juglans mandshurica and J. cathayensis are regressed onto geographic distance between admixed individuals (a) and all individuals (b) and for nuclear DNA between admixed individuals (c) and all individuals (d). Pairwise genetic distance for nuclear DNA are regressed onto environmental distance between admixed individuals (e) and all individuals (f). The red lines in panels (c) and (d) indicate linear regression.
