1987
The antigenic specificities of lesion-derived CD4+ T-cell clones are quite diverse and include at least 10 epitopes.
 ( cell line: lesion-derived CD4+ T-cell clones, 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: lesion-derived CD4+ T-cell clones, None) 