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FWIW, It's a commentary by John Ruben, discussing the four-winged Microraptor 
paper by D. Alexander, Larry Martin et al in an earlier issue of PNAS. Think 
more like a Nature News & Views than a peer reviewed paper. 

At 6:38 PM -0800 2/9/10, T. Michael Keesey wrote:
>On Tue, Feb 9, 2010 at 5:51 PM, Denver Fowler <df9465@yahoo.co.uk> wrote:
>> A new study just published in the Proceedings of the National Academy of 
>> Sciences provides yet more evidence that birds did not
>> descend from ground-dwelling theropod dinosaurs, experts say, and continues 
>> to challenge decades of accepted theories about the evolution
>> of flight.
>>From the article, it looks their beef is with the "ground-dwelling"
>parting, not so much the "theropod dinosaurs" part.
>> PNAS has recently published widely disputed (to put it mildly) papers on 
>> venomous theropods, and arthropod-velvet worm hybridisation hypothesis on 
>> the origin of larvae. Now this. Is peer review alive and well at PNAS?

Jeff Hecht, science & technology writer
jeff@jeffhecht.com or jhecht@nasw.org
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