2865
Incorporation of this engineered Fc into trastuzumab , an anti - Her2 antibody , resulted in a 75 % increase in tumor cell phagocytosis by macrophages compared to that of the parental glycosylated trastuzumab with both medium and low Her2 - expressing cancer cells .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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