http://www.imomoko.com/brands/spanx.html Day 180 has 23 protein-coding genes (browser view), including the five SPANX genes (Sperm Protein Associated With the Nucleus on the X Chromosome.)
Like many sperm-expressed genes, the SPANX genes are under strong positive selection.
Click here to see all 8668939 letters of Day 180 with SPANXB1 underlined.