10940
Heterologous expression of ligand - gated ion channels ( LGICs ) in Xenopus laevis oocytes combined with site - directed mutagenesis has been demonstrated to be a powerful approach to study structure - function relationships .
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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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