Figure 5. PRDM9 zinc finger array diversity in chimpanzees.

Shown is a schematic representation of the zinc finger arrays of the 34 chimpanzee alleles described across three datasets. Each colored box represents a different finger, and asterisks denote fingers with synonymous differences. The grey boxes represent fingers that were not sequenced but are assumed to be ZF “L”. The variability in ZF content and array size can be clearly seen in the different alleles. Although the rapid evolution of the ZF domain structure makes it difficult to precisely detail ancestral relationships between alleles, the 5′ end of the arrays displays structural patterns that enable alleles to be grouped for Hardy-Weinberg analysis.