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Haplotype diversity (Hd) of five genes involved in FT (HvCbf3, HvCbf6, HvCbf9, HvCbf14 and Vrn-H1) plus two reference genes (α-Amy1 and Gapdh) recorded in two subgroups of European cultivars released before 1980 a and after 1980 b, respectively. More recent cultivars showed a loss of Hd, for almost all genes
