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Here we discuss the role of the cortical cholinergic system in mediating cue detection and attentional control and propose two target mechanisms for cognition enhancers : stimulation of prefrontal alpha 4 beta 2 * nicotinic acetylcholine receptors ( nAChR ) for the enhancement of cue detection and augmentation of tonic acetylcholine levels for the enhancement of attentional control .
 Chemical: acetylcholine; Chemical: acetylcholine
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: acetylcholine; Chemical: acetylcholine