2598
In contrast , DCPIB had no direct effect on vesicular glutamate release from rat brain synaptosomes or the cystine / glutamate exchange in astrocytes .
 DCPIB, glutamate, cystine, glutamate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DCPIB, glutamate, cystine, glutamate