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Perceived social support and tumor estrogen/progesterone receptor status as predictors of natural killer cell activity in breast cancer patients .
 protein: estrogen/progesterone receptor; protein: natural killer cell activity; cell type: natural killer 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:
 protein: estrogen/progesterone receptor; protein: natural killer cell activity; cell type: natural killer cell