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The above results mean that the increase in alpha - adrenergic receptors makes the prostate , which has been already hypertrophied , less elastic , inhibiting external urinary sphincter function .
 GENE: alpha - adrenergic receptors
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: alpha - adrenergic receptors