2754
Toxinologists have made significant contributions to deciphering the structure , molecular evolution , mechanisms of action , receptors , role of enzymatic activity for toxicity , structural determinants of toxicity and selectivity , and the impact of these enzymes in the overall pathophysiology of snakebite envenoming .
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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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