1320
Amino acids 5 and 7 , two potent and selective competitive GluR5 KA receptor antagonists , exhibited high GluR5 receptor affinity over other glutamate receptors .
 Chemical: KA; Chemical: glutamate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: KA; Chemical: glutamate