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. 2017 Sep 25;19(3):391–406. doi: 10.1093/biostatistics/kxx048

Fig. 1.

Fig. 1.

(a) Illustration of the typical data format with two tissues. Genotype data Inline graphic is available for Inline graphic SNPs and each of Inline graphic samples. Expression measurements are available for Inline graphic genes; sample sets for different tissues may not be the same. (b) z-statistics for lung and thyroid: density plot for all local gene–SNP pairs (top), and scatter plot for significant local gene–SNP pairs with tissue specificity by gray scale (bottom). The gene–SNP pairs deemed insignificant are omitted, leading to the white space at the center of the plot. The remaining points are colored according to their assessed tissue specificity: dark gray points correspond to the Lung-specific eQTL; black points correspond to the Thyroid-specific eQTL; light gray points correspond to the cross-tissue eQTL.