3499
We present immunological and mass spectrometry evidence for preservation of proteins comprising extant osteocytes ( Actin , Tubulin , PHEX , Histone H4 ) in osteocytes recovered from two non - avian dinosaurs .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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