17951
Compared to DAT - WT mice , serotonin levels were increased in DAT - HET and - KO mice in frontal cortex and hippocampus , respectively , and serotonin turnover rates were increased ~ 30 % in the striatum of DAT - KO mice .
 Chemical: serotonin
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