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Frames 18&ndash ; 21 then depict the depolarization as it travels throughout both ventricles from the apex of the heart , following the action potential in the Purkinje fibers .
 person: Purkinje
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Purkinje 
Answer:
 person: Purkinje