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We show that transcription of the BLR2 gene could be specifically induced in Epstein-Barr virus negative BL 41 cells via estrogen-mediated activation of Epstein-Barr virus nuclear antigen 2 , a key regulator of viral and cellular genes in immortalized B cells .
 cell line: immortalized B cells; protein: Epstein-Barr virus nuclear antigen 2; protein: BLR2; DNA: cellular genes; DNA: viral; DNA: BLR2 gene; DNA: viral and cellular genes; cell line: Epstein-Barr virus negative BL 41 cells
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 line: immortalized B cells; protein: Epstein-Barr virus nuclear antigen 2; protein: BLR2; DNA: cellular genes; DNA: viral; DNA: BLR2 gene; DNA: viral and cellular genes; cell line: Epstein-Barr virus negative BL 41 cells