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Tumor cells showed an overexpression of p53 protein and were estrogen receptor -positive .
 protein: estrogen receptor; protein: p53 protein; cell type: Tumor cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: estrogen receptor, p53 protein, Tumor cells 
Answer:
 protein: estrogen receptor; protein: p53 protein; cell type: Tumor cells