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A similar infection with a recombinant retrovirus containing the beta-galactosidase gene with an adenovirus E2 promoter , results in beta-galactosidase activity in a limited number of cultured and primary cells .
 cell line: cultured; cell type: primary cells; DNA: adenovirus E2 promoter; DNA: beta-galactosidase gene; protein: beta-galactosidase; protein: beta-galactosidase
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: cultured; cell type: primary cells; DNA: adenovirus E2 promoter; DNA: beta-galactosidase gene; protein: beta-galactosidase; protein: beta-galactosidase