11419
The purpose of the current study was to address two possible methodological limitations of our previous report , namely that ( 1 ) [ ( 3 ) H ] - ( + ) - PHNO may have been administered at non - tracer dose , potentially causing underestimate of D3 receptor occupancy , and ( 2 ) antipsychotic drugs were administered chronically , potentially causing increased D3 receptor expression not accounted for in the vehicle - treated control group .
 Chemical: [ ( 3 ) H ] - ( + ) - PHNO
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: [ ( 3 ) H ] - ( + ) - PHNO