14919
Human CD4 lymphocytes specifically recognize a peptide representing the fusion region of the hybrid protein pml/RAR alpha present in acute promyelocytic leukemia cells .
 ( cell type: acute promyelocytic leukemia cells, None) , ( protein: hybrid protein, None) , ( protein: pml/RAR alpha, None) , ( cell type: Human CD4 lymphocytes, 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 type: acute promyelocytic leukemia cells, None) , ( protein: hybrid protein, None) , ( protein: pml/RAR alpha, None) , ( cell type: Human CD4 lymphocytes, None) 