3678
Adolescent male rats are less sensitive than adults to the anxiogenic and serotonin - releasing effects of fenfluramine .
 Chemical: serotonin; Chemical: fenfluramine
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: serotonin; Chemical: fenfluramine