This is possibly the most important discovery in biology since DNA itself. In very short it may give us some of the answers to why genetic variation within and between species can create so many similarities and differences. For example the black fur in canines is believed to have originated in domestic (prehistoric) animals, and then moved back out into the wild. It also could be part of the mechanism that controls changes in humans across the course of their life like the emergence and regression of allergies, or the changing of hair color. Absolutely fascinating.
This is probably my next fun non-fiction read. It looks like a refreshing divergence in psychology.