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QQ plot of −log10 (p) as calculated from the test of parental allelic exchangeability. Ninety five percent confidence intervals are shown. Four SNPs (rs17269319, rs3747355, rs5906541, and rs12558269) are not shown because of extremely low p-values. No fathers carried the minor alleles for these four SNPs and the quality of genotyping consequently appears to be inadequate.
