Figure 4From: Bias in effect size of systemic lupus erythematosus susceptibility loci across Europe: a case-control studyCorrelation between North-South population differentiation axis and number of systemic lupus erythematosus risk alleles. Mean number of SLE risk alleles per sample collection is represented against the North/South score (N/S score) obtained in the same samples. Collection letter codes are as in Table 1.Back to article page