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These illnesses are a result of saxitoxin ' s ability to bind to the voltage - gated sodium channel , blocking the passage of nerve impulses and leading to death via respiratory paralysis .
 Chemical: saxitoxin; Chemical: sodium
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: saxitoxin, sodium 
Answer:
 Chemical: saxitoxin; Chemical: sodium