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To assess the safety of the angiotensin converting enzyme inhibitor enalapril a multicenter , open , randomized , prazosin - controlled trial was designed comparing the incidence and severity of symptomatic hypotension on the first day of treatment .
 GENE: angiotensin converting enzyme
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: angiotensin converting enzyme