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Cluster analysis of 24 single-nucleotide polymorphisms (SNPs) from the parental samples (n = 308). The vertical broken bar represents the cutoff value used to designate the tag SNPs, which are indicated with an asterisk. SNPs 1, 4, 7, and 18 (our previous report13) are represented by the numbers M6, M9, M12, and M20, respectively) (arrow indicated). The numbers M1–M5 and M21–M24 represent SNPs outside the 20-kb “critical region” as reported in our previous report.13
