5298
In this review , we highlight the role of these vital lipids in the function of two representative GPCRs , the serotonin ( 1A ) receptor and the adrenergic receptor .
 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