15613
Neuregulin - 1 ( NRG - 1 ) / ErbB signaling has an indispensable role in cardiac development and in the maintenance of the structural and functional integrity of the human adult heart in health and disease .
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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:
 None