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Here , we explored the role of inducible nitric oxide synthase ( iNOS ) in the S - nitrosation of proteins involved in the early steps of the insulin - signaling pathway and insulin resistance in the skeletal muscle of aged mice .
 Chemical: nitric oxide; Chemical: S
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: nitric oxide; Chemical: S