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The present findings , together with previous data , indicate that in contrast to 5 - HT , which appears to play a role during the early phases of contextual aversive memory consolidation , longer - lasting GABA - mediated mechanisms are recruited during the expression of contextual fear memories .
 Chemical: 5 - HT; Chemical: GABA
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: 5 - HT; Chemical: GABA