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Retroviral mediated transfer and expression of exogenous genes in primary lymphoid cells : assaying for a viral transactivator activity in normal and malignant cells .
 DNA: exogenous genes; cell type: primary lymphoid cells; protein: transactivator
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: exogenous genes; cell type: primary lymphoid cells; protein: transactivator