5401
The effect of the Ca entry blocker nitrendipine , the antioxidant superoxide dismutase ( SOD ) , and a combination of nitrendipine and superoxide dismutase on postischemic renal function was studied in four groups ( n = 24 ) of rats .
 superoxide dismutase, SOD, superoxide dismutase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 superoxide dismutase, SOD, superoxide dismutase