This article from LiveScience [1]shows what incredible things can be accomplished when scientists search hard to find even a bit of surviving soft tissue in a T-rex femur:
An adolescent female Tyrannosaurus rex died 68 million years ago, but its bones still contain intact soft tissue, including the oldest preserved proteins ever found, scientists say. And a comparison of the protein’s chemical structure to a slew of other species showed an evolutionary link between T. rex and chickens, bolstering the idea that birds evolved from dinosaurs . . . A comparison by Asara’s team of the amino-acid sequence from the T. rex collagen to a database of existing sequences from modern species showed it shared a remarkable similarity to that of chickens.
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