1492
A mechanism is suggested whereby expression of c-jun and junB , in the absence of members of the fos family , can prevent inappropriate activation of T cells caused by ligation of CD28 in the absence of a specific antigenic stimulus .
 cell type: T cells; DNA: c-jun; DNA: fos family; protein: CD28; DNA: junB
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: T cells, c-jun, fos family, CD28, junB 
Answer:
 cell type: T cells; DNA: c-jun; DNA: fos family; protein: CD28; DNA: junB