14558
The relationship between glucocorticoid effect and regulation of cell surface antigens was investigated in two models of leukemic cell lines , CEM C7 denoted (r+, ly+) and CEM C1 (r+, ly-).
 ( protein: cell surface antigens, None) , ( cell line: CEM C1, None) , ( cell line: leukemic cell lines, None) , ( cell line: CEM C7, 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:
 ( protein: cell surface antigens, None) , ( cell line: CEM C1, None) , ( cell line: leukemic cell lines, None) , ( cell line: CEM C7, None) 