1270
In this multicenter , double - blind , placebo - controlled , randomized , four way cross - over proof - of - mechanism study , we tested the effect of the positive allosteric alpha 7 nicotinic acetylcholine receptor ( nAChR ) modulator JNJ - 39393406 in a key translational assay ( sensory P50 gating ) in 39 regularly smoking male patients with schizophrenia .
 Chemical: acetylcholine; Chemical: JNJ - 39393406
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: JNJ - 39393406