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 .
 acetylcholine transporter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 acetylcholine transporter