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In conclusion , our results indicate that environmental oxygen levels affect tissue vascularization and fracture healing , and that providing oxygen when fractures are accompanied by ischemia may be beneficial .
 Chemical: oxygen; Chemical: oxygen
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: oxygen