7519
Although the voltage - dependent OHC membrane motor , prestin , has been demonstrated to be essential for mammalian cochlear amplification , the molecular mechanism by which prestin converts electrical energy into mechanical displacement / force remains elusive .
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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