23097
Anatoxin - a is one of the common and major cyanobacterial neurotoxins acting as a powerful agonist at nicotinic acetylcholine receptors ( nAChR ) .
 Chemical: Anatoxin - a; 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: Anatoxin - a; Chemical: acetylcholine