1072
Contributing to this enhancement are : 1 ) the normalized firing rate of 5 - HT neurons in the presence of milnacipran 2 ) the desensitization of the terminal 5 - HT1B autoreceptor , and 3 ) the desensitization of the alpha2 - adrenergic heteroreceptors on 5 - HT terminals .
 5 - HT neurons
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 5 - HT neurons