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. 2010 Jan 13;5(1):e8219. doi: 10.1371/journal.pone.0008219

Figure 3. Quality score (Q) and genotypic contingency test thresholds eliminate read position bias during SNP calling.

Figure 3

The 470K SNP set is enriched with SNPs identified from the ends of reads. Panel A demonstrates that this read position bias can be eliminated by applying a Q score threshold. Panel B demonstrates that the genotypic contingency test also improves SNP calling.