21732
This study aims to investigate potential diabetic retinopathy ( DR ) risk factors by evaluating the circulating levels of pentosidine , soluble receptor for advanced glycation end - product ( sRAGE ) , advanced oxidation protein product ( AOPP ) as well as glutathione peroxidase ( GPx ) and superoxide dismutase ( SOD ) activities in DR patients .
 Chemical: pentosidine; Chemical: glutathione; Chemical: superoxide
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: pentosidine; Chemical: glutathione; Chemical: superoxide