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Map of the S-locus genomic region in Arabidopsis lyrata, with locations of the 12 flanking genes investigated in this study. The shaded box indicates the S-locus nonrecombining region containing the SRK and SCR genes involved in the incompatibility reaction. Vertical segments indicate the positions of fragments studied (the eight fragments newly sequenced in this study are underlined). The two arrows indicate the precise limits of the flanking regions investigated.
