Muchikamu cheMarch 2005 cheScience, Mary Higby Schweitzer weNorth Carolina State University nevamwe vake vakazivisa kupora kwehutano hwakapfava kubva mumakumbo emakumbo akavezwa kubva kuTyrannosaurus rex. Mapfupa akanga aputsika nemaune, kunyange zvazvo asingadi, akaputsika nokuda kwekutumira uye haana kuchengetedzwa nenzira yakajairika, kunyanya nokuti Schweitzer akanga achitarisira kuedza kuti ave nemapfupa akapfava. Yakasarudzwa seMuseum yeRockies specimen 1125, kana MOR 1125, dinosaur yakambove yakacherwa kubva kuHell Creek Formation. Midziyo yeropa inochinja, bifurcating uye fibrous asi elastic bone tissue matrix yakaonekwa. Mukuwedzera, microstructures yakafanana nemasero eropa akawanikwa mukati mematrix nemidziyo yeropa. Zvimiro zvinotakura kufanana nemasero ehukuti uye midziyo yemidziyo yega yega. Kana zvisingazivikanwe, pfupa rakanga rakaputsika nemaune uye ipapo harina kuchengetedzwa nenzira yakajairika, kunyanya nekuti Schweitzer aitarisira kuedza kuti aongorore kuti
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