Oh my! This egg looks like a collection of mitochondria, DNA, and other mysterious organelles!
Deenas are the most elemental of creatures: they are literally living strands of DNA. Deenas are thought by the Science and Research Center in Ark City to be all-knowing about the mysteries of DNA, what it does, and how it can be fixed when its broken. For the purposes of health research, Deenas are being studied extensively.
Deenas also have the ability to change your DNA on the spot. Don't like your hair or eye color? Find a Deena and they can change it for you! Want to be shorter or taller? A Deena might have a solution for you. Since Deenas have arrived onto the scene, thousands of Arkians have experimented with changing themselves. Some Arkians are even trying to alter their own creatures themselves.
While not illegal, note that the process of changing your DNA is entirely unregulated by the Town Hall in Ark City. The repercussions of altering your own DNA are unknown and could lead to unwanted mutations and catastrophic health consequences.