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All of the CLL cases except two (96%) were negative for ER (less than 1% staining; less than 4 fmol/mg protein).
 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:
 protein: ER