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Alvarezsauridae
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===Feathers=== At least one specimen of alvarezsaurid, from the [[species]] ''[[Shuvuuia|Shuvuuia deserti]]'', preserved down-like, [[feather]]y, [[integument]]al structures covering the fossil. Schweitzer ''et al.'' (1999) subjected these filaments to microscopic, morphological, mass spectrometric, and immunohistochemical studies and found that they consisted of [[beta-keratin]], which is the primary protein in [[feather]]s.<ref name="Schweitzeretal1999">{{cite journal |last1=Schweitzer |first1=M. H. |last2=Watt |first2=J. A. |last3=Avci |first3=R. |last4=Knapp |first4=L. |last5=Chiappe |first5=L. |last6=Norell |first6=M. |last7=Marshall |first7=M. |title=Beta-keratin specific immunological reactivity in feather-like structures of the Cretaceous Alvarezsaurid, Shuvuuia deserti |journal=Journal of Experimental Zoology |date=1999 |volume=285 |issue=2 |pages=146β157 |doi=10.1002/(SICI)1097-010X(19990815)285:2<146::AID-JEZ7>3.0.CO;2-A |pmid=10440726 }}</ref>
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