21540
The hypothesis of this study was that IL - 1 beta is part of a pro - inflammatory positive feedback loop that sustains a persistent pro - inflammatory wound macrophage phenotype which contributes to impaired healing in diabetes .
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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:
 None