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Serotonin modulates the acquisition and retention of conditioned emotional memory , and the serotonin 2A receptor ( 5HT2AR ) may be one of the postsynaptic targets mediating such effects .
 Chemical: Serotonin; Chemical: serotonin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Serotonin; Chemical: serotonin