AGT and atrial fibrillation: The LD plot indicates that compared with the non-AF heart disease control and the healthy control group, for AGT gene, block 1 (SNPs 2–3: size 1598bp) with high LD were identified, encompassing the downstream intron 1 and the former exon 2 (Figs. 1B, 2B); And compared with the healthy control group, block 2 (SNPs 6–7: size 292bp) with high LD were identified, encompassing the intron region (Fig. 2B).