19620
Furthermore , Q beta elicited much higher levels of IgG antibodies than other types of virus - like particles , and the IgG antibodies produced reacted strongly with the native Tn antigens on human leukemia cells .
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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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