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Transforming growth factor beta ( TGF - beta ) , a key mediator of fibrotic responses , is increased in asthma and drives airway remodeling by inducing expression of extracellular matrix ( ECM ) proteins .
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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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