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Recent advances in saxitoxin research are discussed , including the molecular biology of toxin synthesis , new protein targets , association with metal - binding motifs and methods of detection .
 Chemical: saxitoxin
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 
Answer:
 Chemical: saxitoxin