6653
Heat pre - treated and non heat pre - treated whey protein isolate ( WPI ) were hydrolysed using alpha - chymotrypsin ( chymotrypsin ) , pepsin and trypsin .
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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:
 None