Washington, July 30 - A new analysis of the remains of a Tyrannosaurus rex that roamed Earth 68 million years ago has confirmed traces of protein from blood, bone and tendons.

These findings are the latest addition to an ongoing controversy over which biochemical remnants can be detected in the ferocious dinosaur.

Marshall Bern of the Palo Alto Research Centre (PARC), with colleagues Brett S. Phinney and David Goldberg, point out that the first analysis in 2007 of a well-preserved, fossilized T. rex bone identified traces of seven distinct protein fragments, or peptides, from collagen.

That material is one of the primary components of bone, tendons and other connective tissue. However, later studies disputed that finding, suggesting that it was a statistical fluke or the result of contamination from another laboratory sample.