1374
The ameliorating action of nicotine on PPI deficits in DAT KO mice was blocked by mecamylamine , the alpha 7 nACh receptor antagonist methyllycaconitine or WAY100635 , while the alpha 4 beta 2 nACh receptor antagonist dihydro - beta - erythroidinehydrobromide ( DH beta E ) produced only a non - significant trend toward attenuation of nicotine effects .
 Chemical: nicotine; Chemical: mecamylamine; Chemical: methyllycaconitine; Chemical: WAY100635; Chemical: dihydro - beta - erythroidinehydrobromide; Chemical: DH beta E; Chemical: nicotine
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: nicotine; Chemical: mecamylamine; Chemical: methyllycaconitine; Chemical: WAY100635; Chemical: dihydro - beta - erythroidinehydrobromide; Chemical: DH beta E; Chemical: nicotine