1475
The NS-Meg cells were positive for alpha-naphthyl acetate esterase and periodic acid-Schiff (PAS) staining and for surface CD4 , CD7 , CD13 , CD34 , CD41a , and glycophorin A antigens .
 ( protein: CD41a, None) , ( protein: CD34, None) , ( protein: glycophorin A antigens, None) , ( cell line: NS-Meg cells, None) , ( protein: CD4, None) , ( protein: alpha-naphthyl acetate esterase, None) , ( protein: CD13, None) , ( protein: CD7, 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: CD41a, None) , ( protein: CD34, None) , ( protein: glycophorin A antigens, None) , ( cell line: NS-Meg cells, None) , ( protein: CD4, None) , ( protein: alpha-naphthyl acetate esterase, None) , ( protein: CD13, None) , ( protein: CD7, None) 