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Cultured MCF-7 cells , derived from a pleural effusion of a breast cancer patient , known to contain high levels of ER were used as a positive control (40-48% ER positive cells by immunocytochemistry; 200 fmol/mg protein by EIA).
 cell type: ER positive cells; protein: ER; cell line: Cultured MCF-7 cells; protein: ER
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: ER positive cells; protein: ER; cell line: Cultured MCF-7 cells; protein: ER