19377
The multimeric SPAN P - elapitoxin - As1a ( P - EPTX - As1a ) along with two novel monomeric SPANs and a new postsynaptic alpha - neurotoxin were then pharmacologically characterized using the chick biventer cervicis nerve - muscle preparation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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