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No age-related differences were found in the expression of either of these two proto-oncogenes by anti-CD2 activated T cells.
 DNA: proto-oncogenes
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:
 DNA: proto-oncogenes