Fig. 1From: CHRNA5/CHRNA3 gene cluster is a risk factor for lumbar disc herniation: a case-control studyLD structures of the 15 SNPs genotyped in CHRNA5/CHRNA3 gene. The LD strengths between paired SNPs are shown in color according to the confidence intervals’ model. Red squares display statistically significant associations between a pair of SNPs, as measured by D’; darker shades of red indicate higher D’Back to article page