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METHODS AND RESULTS : Transmembrane action potentials from epicardium , midmyocardium , and endocardium were recorded simultaneously , together with a transmural ECG , in arterially perfused canine and rabbit left ventricular preparations .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 None