7476
Together, these results demonstrate that ER and PR can be activated by endogenous or exogenous ligands to induce a genetic response that impairs TNF-alpha -induced apoptosis in U937 cells .
 cell line: U937 cells; protein: PR; protein: TNF-alpha; protein: ER
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: U937 cells, PR, TNF-alpha, ER 
Answer:
 cell line: U937 cells; protein: PR; protein: TNF-alpha; protein: ER