1131
After stimulation by PMA , RXR alpha expression increased in H9 and U937 cells but not in CEM cells .
 protein: RXR alpha; cell line: U937 cells; cell line: H9; cell line: CEM 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: RXR alpha, U937 cells, H9, CEM cells 
Answer:
 protein: RXR alpha; cell line: U937 cells; cell line: H9; cell line: CEM cells