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MSNBC article

Just read the Tom Holtz  article concerning Bird Origins. Interesting
summary, but I was disappointed not to see mention of  opposing views
stating Birds as ancestors to Dinos.  I thought this was to be an expose on
alternative views of Bird Origins??
Anyway, I found the section on Digit homology to be enlightening! I never
heard of "frame shift". Is this a new concept? Feduccia dosen`t mention it
in his book. Is it more recent? How does it account for the necrotic region
at the anterior end of the limb bud?
Anyone have any refs concerning this research?