23601
Growing MSCs on a specific blend combination of cellulose and silk in a 75 : 25 ratio significantly upregulated the chondrogenic marker genes SOX9 , aggrecan , and type II collagen in the absence of specific growth factors .
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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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