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Here , we provide evidence that maspin acts as a reactive oxygen species ( ROS ) scavenger through oxidation of three structurally exposed cysteine thiols to sulfenic acid .
 Chemical: oxygen; Chemical: cysteine thiols; Chemical: sulfenic acid
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: cysteine thiols; Chemical: sulfenic acid