2766
Furthermore , agonist action at a 5 - HT1 receptor and antagonist action at 5 - HT2 receptors both appear to contribute to antidepressant - like activity on the DRL 72 - s schedule .
 GENE: 5 - HT1 receptor; GENE: 5 - HT2 receptors
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: 5 - HT1 receptor; GENE: 5 - HT2 receptors