11184
We found that the amplitude of the cortical evoked potentials ( amplitude of the N2 / P2 peak ) increased from 5 . 1 + / - 0 . 7 microV at 5 mA to 16 . 3 + / - 1 . 1 microV at 20 mA .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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