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We also demonstrated that 3 % O ( 2 ) affected BMSC differentiation in p53 and reactive oxygen species ( ROS ) independent pathways .
 Chemical: O ( 2 ); 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: O ( 2 ); Chemical: oxygen