Fig. 2.

Q-Q plot to assess the GWAS results. Each dot in (a) indicates a SNP, whereas that in (b) indicates a unitig. Y-axis: observed $-{\log }_{10}\left(P\right)$ of each SNP or unitig, where P is its P-value. X-axis: expected $-{\log }_{10}\left(P\right)$ under the null hypothesis of no association. Non-synonymous and intergenic SNPs with P<10^-4 and associated with GC are presented as red and green, respectively. GC, gastric cancer; SNP, single nucleotide polymorphism.