21332
Ligand binding was determined against the light and heavy chain BoNT / A complex through either radiolabeled ligand binding assays ( nonfluorescent ligands ) or fluorescence intensity assays ( fluorescent ligands ) .
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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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