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Early T. rex ancestor found in South America

Thursday, January 13, 2011 | 5:18 p.m. CST; updated 9:27 p.m. CST, Thursday, January 13, 2011

WASHINGTON — Back at the dawn of the dinosaur era, a quick-moving predator set the stage for the famous and fearsome giants that followed in its footsteps, according to new research.

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