ní March 2005 issue of Science, Mary Higby Schweitzer of North Carolina State University and colleagues announced the recovery of soft tissue from the marrow cavity of a fossilized leg bone from a Tyrannosaurus rex. egungun ti a ti nkọju si, biotilejepe reluctantly, a fọ fun gbigbe ati ki o ko pa ni deede ona, ni pato nitori Schweitzer ti wa ni ireti lati se idanwo o fun asọ ara. ti a yan bi awọn Museum of the Rockies ayẹwo 1125, tabi MOR 1125, awọn dinosaur ti a ti tẹlẹ excavated lati Hell Creek Formation. rọ, bifurcating ẹjẹ ohun elo ati fibrous sugbon elastic egungun matrix ti a mọ. ni afikun, microstructures resembling ẹjẹ awọn sẹẹli ti a ri inu awọn ohun elo ati awọn ohun elo. awọn ẹya mu resemblance si ostrich sẹẹli ati ohun elo ti a ko mọ. ti o ba ti awọn egungun ti a ti lo gangan, biotileje reluctly, ati ki o si tun ko ni a mọ ni deede ona, ni pato nitori Schweitzer ni ireti
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