19640
ExD MS relies on interactions between gas phase peptide or protein ions carrying multiple positive charges with either free low - energy ( ~ 1 eV ) electrons ( ECD ) , or with reagent radical anions possessing an electron available for transfer ( ETD ) .
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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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