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Mice with tibia fracture were housed in custom - built gas chambers and groups breathed a constant atmosphere of 13 % oxygen ( hypoxia ) , 21 % oxygen ( normoxia ) , or 50 % oxygen ( hyperoxia ) .
 Chemical: oxygen; 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; Chemical: oxygen