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A murine monoclonal antibody raised to an unidentified estrogen receptor-related 29-kDa protein selectively recognized these proteins as well as a more basic, unphosphorylated 27-kDa protein .
 protein: unidentified estrogen receptor-related 29-kDa protein; protein: unphosphorylated 27-kDa protein; protein: murine monoclonal antibody
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: unidentified estrogen receptor-related 29-kDa protein; protein: unphosphorylated 27-kDa protein; protein: murine monoclonal antibody