Fig. 1

Diversity in the Cys2His2-ZnF domain in minke whales. A Prdm9 gene annotation in Balaenoptera acutorostrata scammoni genome reference, with primer site annotations and predicted PRDM9 protein from nucleotide translation (B) Representative PCR products of DNAs from individuals from AN IV (294,271), AN V (1653), NP (K8030) and NA (MN2), showing variation in the number of minisatellite repeats units (number of ZnFs in brackets) (C) Stylized structure of ZnF binding to DNA, with nucleotide-specificity conferred by amino-acids in positions − 1, + 2, + 3, and + 6 of alpha-helices. D PRDM9 ZnF arrays identified in minke whales, named with broad-scale sampling location, Northern Hemisphere (NH) and Southern Hemisphere (SH) and the total number of ZnFs in the ZnFs domain. E Types of PRDM9 ZnFs in minke whales. Three-letter codes were generated using the IUPAC nomenclature of amino-acids involved in DNA binding. All variable amino acids are colored, and asterisks label ZnFs also present in genome references of Balaenoptera acutorostrata scammoni (*Ba) or Balaenoptera bonaerensis (*Bb), see also Additional File 6