16749
The role of alpha 1 - adrenergic receptors ( ARs ) in the regulation of cardiac hypertrophy is still unclear , because transgenic mice demonstrated hypertrophy or the lack of it despite high receptor overexpression .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None