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Glutamate mediates the vast majority of excitatory synaptic transmission in the vertebrate CNS and while presence of glutamate input in the LDT has been shown and ionotropic responses to glutamate have been reported in the LDT , characterization of metabotropic responses is lacking .
 Chemical: Glutamate; Chemical: glutamate; Chemical: glutamate
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: Glutamate, glutamate, glutamate 
Answer:
 Chemical: Glutamate; Chemical: glutamate; Chemical: glutamate