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Random migration ( RM ) and chemotactic migration ( ChtM ) of human leukocytes to yeast activated serum were studied with the modified Boyden chamber method .
 cell type: human leukocytes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cell type: human leukocytes