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Mouse fibroblast L929 cells were encapsulated and cultured within the hydrogel matrices , and the encapsulated cells were shown to be highly viable in the gel matrices , suggesting that the hydrogels have excellent cytocompatibilities .
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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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