4388
Only a few reports exist , however , on the relationship between the serum concentrations of selective serotonin reuptake inhibitors ( SSRIs ) and their toxic effects .
 Chemical: serotonin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: serotonin