5157
A lot of controversies still exist regarding their binding affinity , effects of 5 - HT6 ligands on brain catecholamines , behavioral syndromes regulated by them , and brain distribution .
 Chemical: catecholamines
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: catecholamines