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Renin studies performed in 34 hypertensive patients and in a control group of 11 recipients showed that elevation of plasma renin activity and of plasma aldosterone level is frequent but difficult to interpret , particularly when a renal artery stenosis is observed .
 Renin, plasma renin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Renin, plasma renin