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Measurements of [ ( 3 ) H ] saxitoxin ( STX ) binding showed a significant reduction in the level of plasma membrane sodium channels in beta2 ( - / - ) neurons .
 Chemical: saxitoxin; Chemical: STX; Chemical: sodium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: saxitoxin; Chemical: STX; Chemical: sodium