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Skim milk with low levels of added beta - mercaptoethanol ( SM - ME ) and untreated skim milk ( SM ) were heated and then made into acid gels .
 Chemical: beta - mercaptoethanol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: beta - mercaptoethanol