22018
During the past decade mass spectrometry ( MS ) has become one of the major suitable techniques for peptide and protein analysis from animal venoms , not only to identify new toxins within these complex mixtures , but also for toxin structural studies .
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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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