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One possible mechanism linking inflammation with cancer involves the generation of reactive oxygen , nitrogen , and halogen species by activated macrophages and neutrophils infiltrating sites of infection or tissue damage , with these chemical mediators causing damage that ultimately leads to cell death and mutation .
 Chemical: oxygen; Chemical: nitrogen; Chemical: halogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: oxygen; Chemical: nitrogen; Chemical: halogen