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Considering their protective action in lesioned sites , MSCs ' secretome might also improve the integration of local progenitor cells in neuroregeneration processes , opening a door for their future use as therapeutical strategies in human clinical trials .
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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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