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Fig. 1. Five breeding schemes (Breeding Plan 2 to 6) for marker-assisted introgression of two genes and a reference scheme (Breeding Plan 1) for introgression of two genes without background selection. DA and DB are the donor lines of the target genes, R is the recipient line. The symbols denote: | no selection,  selection only for presence of the target gene(s),  selection for presence of the target gene(s) and marker-assisted background selection, x crossing, and  selfing,  ,  , and  indicate generations with crossing, backcrossing, and selfing, respectively.
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