11472
[ 18F ] ( + ) - 4 - fluorobenzyltrozamicol ( FBT ) , which selectively binds to the vesicular acetylcholine transporter in the presynaptic cholinergic neuron , has previously been shown to be a useful ligand for the study of cholinergic terminal density in the basal ganglia with PET .
 GENE: acetylcholine transporter
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: acetylcholine transporter 
Answer:
 GENE: acetylcholine transporter