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The tumour suppressor p53 has been shown to regulate this type of apoptosis in thymocytes , but an as yet unknown, p53 -independent pathway (s) appears to mediate the same event in mitogen-activated mature T lymphocytes .
 cell type: thymocytes; protein: p53; cell line: mitogen-activated mature T lymphocytes; protein: tumour suppressor p53
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: thymocytes; protein: p53; cell line: mitogen-activated mature T lymphocytes; protein: tumour suppressor p53