28074
Idiopathic pulmonary fibrosis ( IPF ) is a progressive interstitial lung disease ( ILD ) of unknown origin characterized by epithelial cell dysfunctions , accumulation of fibroblasts and myofibroblasts and relentless deposition of extracellular matrix ( ECM ) .
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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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