19291
DRG neurons were dissociated and cultured for 48 hours and then exposed to IGF - 1 ( 20 nmol / L ) , Glu ( 0 . 2 mmol / L ) , Glu ( 0 . 2 mmol / L ) plus IGF - 1 ( 20 nmol / L ) for additional 24 hours .
 Glu, Glu
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Glu, Glu