Bringing Col2A1 back:

While other studies have examined extinct coding DNA function in vitro, this is the first example of the restoration of extinct non-coding DNA and examination of its function in vivo. Our method using transgenesis can be used to explore the function of regulatory and protein-coding sequences obtained from any extinct species in an in vivo model system, providing important insights into gene evolution and diversity.

Same deal for IRGM:

The exact reason that IRGM was reborn in species such as humans and apes, but not monkeys, is not yet completely understood. We do know, however, that the fact that most humans have a working copy of IRGM is quite fortuitous. As mentioned above, the IRG genes are essential to controlling bacteria, specifically by maintaining the delicate balance of bacterial growth and immune control in our intestines. Recent research has shown that those without a working copy of IRGM have a greater risk of developing Crohn’s Disease, in which an individual’s immune system begins attacking the friendly bacteria living in our guts.

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