15347
This implies independent functions of subsets of histamine neurons according to their terminal projections , with relevant consequences for the development of specific compounds that affect only subsets of histamine neurones , thus increasing target specificity .
 histamine, histamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 histamine, histamine