13095
The development of electron - based , unimolecular dissociation MS , i . e . electron capture and electron transfer dissociation ( ECD and ETD , respectively ) , has greatly increased the speed and reliability of labile PTM site assignment .
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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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