5851
Further , 5 - HT1A autoreceptor desensitization was evidenced by electrophysiological studies , GTP - gamma - S coupling to 5 - HT1A autoreceptor and a lower hypothermic response to 5 - HT1A activation .
 Chemical: GTP - gamma - S
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: GTP - gamma - S 
Answer:
 Chemical: GTP - gamma - S