http://www.sciencedaily.com/releases...0209131828.htm

Primates' Unique Gene Regulation Mechanism: Little-Understood DNA Elements Serve Important Purpose

While the research fills in a piece of the puzzle as to how our genes operate, it also accentuates the overwhelming complexity of how our DNA shapes us and the many known and unknown players involved. Maquat and Gong plan on exploring the newly identified pathway in future research.
If you think you understand DNA and RNA you don't understand DNA and RNA.

This is CLEARLY the explanation for AIS. (smiley face)