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Since APL cells do not express HLA class II molecules , we tested in two donors (D.E. and C.H.R.) and in patients S.R.and P.G.whether the use of 9-mer peptides ( BCR1/9 ) would generate a CD8 /HLA class I -restricted response .
 ( protein: CD8, None) , ( protein: /HLA class I, None) , ( protein: HLA class II molecules, None) , ( cell line: APL cells, 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: CD8, None) , ( protein: /HLA class I, None) , ( protein: HLA class II molecules, None) , ( cell line: APL cells, None) 