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These results suggest that pregnancy , but not nonpregnancy , lymphocytes contain progesterone binding structures , and that these are inducible by mitogenic or alloantigenic stimuli .
 protein: progesterone binding structures; cell line: lymphocytes
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: progesterone binding structures; cell line: lymphocytes