Figure 4 From: Sequence variation in human succinate dehydrogenase genes: evidence for long-term balancing selection on SDHA A median-joining network groups all SDHA haplotypes (Figure 3) on the basis of number of nucleotide differences. The haplotype RR is probably a recombinant between the two haplogroups. The pie chart for each haplotype depicts the proportional contribution of the African American (filled portion) and the European American (unfilled portion) samples.Back to article page