22779
We took advantage of quantitative proteomic analysis based on isobaric tag for relative and absolute quantitation ( iTRAQ ) and on - line 2D nano - liquid chromatography / tandem mass spectrometry ( LC / MS / MS ) to identify proteins differentially expressed during BMP - 2 - induced chondrogenic differentiation of MEFs .
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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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