21667
CONCLUSIONS : Our results indicate that hippocampal synaptic depression is involved in ketamine - induced memory impairment , and this is modulated by D1 / D5 receptors activation and AMPA receptors endocytosis .
 Chemical: ketamine; Chemical: AMPA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ketamine, AMPA 
Answer:
 Chemical: ketamine; Chemical: AMPA