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They suggest that , in normal conscious rats , the central tachycardia of bromocriptine appears to predominate and to mask the bradycardia of this agonist at peripheral dopamine D2 receptors .
 tachycardia, bromocriptine, bradycardia, dopamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 tachycardia, bromocriptine, bradycardia, dopamine