1431
Both verapamil and propranolol can exhibit additive effects with adenosine in prolonging AV nodal conduction time ; however , only verapamil can reduce the dose of adenosine required to produce AV nodal block .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None