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Recent development of selective radiotracers allow imaging of the serotonin transporter ( SERT ) using positron emission tomography ( PET ) with selective tracers such as [ ( 11 ) C ] DASB .
 Chemical: serotonin; Chemical: [ ( 11 ) C ] DASB
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: [ ( 11 ) C ] DASB