23438
Although metabolic competence was unaffected by oxygen concentrations , culturing at 80 % of oxygen yielded slices with the best biochemical characteristics .
 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