2432
To make clear the roles of RA and RAR alpha in the normal hematopoiesis , I have introduced the construct of human RAR alpha ( hRAR alpha ) into murine bone marrow cells with retroviral vector , and selected infected cells with drug resistant marker ( Neo(r) ) cultured on the stroma cell line ( PA6-neo ), and analyzed the behavior of infected cells .
 ( cell line: PA6-neo, None) , ( protein: hRAR alpha, None) , ( DNA: drug resistant marker, None) , ( protein: RAR alpha, None) , ( cell line: stroma cell line, None) , ( DNA: Neo(r), None) , ( cell type: infected cells, None) , ( cell type: murine bone marrow cells, None) , ( protein: human RAR alpha, None) , ( protein: RAR alpha, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: PA6-neo, None) , ( protein: hRAR alpha, None) , ( DNA: drug resistant marker, None) , ( protein: RAR alpha, None) , ( cell line: stroma cell line, None) , ( DNA: Neo(r), None) , ( cell type: infected cells, None) , ( cell type: murine bone marrow cells, None) , ( protein: human RAR alpha, None) , ( protein: RAR alpha, None) 