3303
Susceptibility to natural killer cells and down regulation of MHC class I expression in adenovirus 12 transformed cells are regulated by different E1A domains .
 cell line: adenovirus 12 transformed cells; DNA: E1A domains; protein: MHC; cell type: natural killer cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: adenovirus 12 transformed cells, E1A domains, MHC, natural killer cells 
Answer:
 cell line: adenovirus 12 transformed cells; DNA: E1A domains; protein: MHC; cell type: natural killer cells