Fig. 3

Maximum likelihood tree of HSFY sequences. HSFY copies identified through annotation of S. scrofa fosmids are shown by their VEGA accession number. Other suid sequences are identified by species. The corresponding region of cattle HSFY2 was used as an outgroup. One species (T. pecari) has a distinct HSFY sequence; the other species all have both long and short forms. Long form copies show little species specific clustering amongst the fosmid sequences, whereas the short form copies show a distinct separation between S. scrofa fosmids and other suids. This likely reflects the potential functional nature of the short form versus the non-functional long form. One sequence (S. scrofa lone) was found outside the HSFY block, near TSPY. The scale bar and branch length show the number of substitutions per site