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After that , all above cultured DRG neurons were processed for detecting mRNA levels of calcitonin gene - related peptide ( CGRP ) and neurofilament - 200 ( NF - 200 ) by real time - PCR analysis .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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