3170
The beta ( 1 ) - adrenergic receptor ( beta ( 1 ) AR ) is the predominant beta AR in the heart and is the main target for beta - adrenergic antagonists , widely used in the treatment of cardiovascular diseases .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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