1805
Antigen recognition stimulates limited proliferation, whereas infection with Epstein-Barr virus ( EBV ) results in continual proliferation and the outgrowth of immortal cell lines .
 cell line: immortal cell lines
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: immortal cell lines