18303
Various immune cells including B cells , T - lymphocytes ( TL ) , natural killer ( NK ) cells , dendritic cells ( DCs ) , macrophages , and polymorphonuclear leukocytes are recruited to the tumor .
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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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