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This report is concerned with the prediction of natural killer (NK) cell activity in 61 Stage I and II breast cancer patients , between the ages of 25 and 70, who were accrued to this project.
 cell type: killer (NK) cell
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: killer (NK) cell