Figure 1 From: Sequence variation in human succinate dehydrogenase genes: evidence for long-term balancing selection on SDHA Minor allele frequency of each SDH subunit variant (also see Additional Table 1) is shown. Filled vertical bars refer to African American, unfilled vertical bars refer to European American samples. Synonymous and non-synonymous coding variants are marked by S and NS, respectively. ID refers to insertion/deletion polymorphisms.Back to article page