6425
Numerous cellular and biochemical abnormalities in immune regulation have been described in patients with systemic lupus erythematosus ( SLE ), including surface Ag receptor -initiated signaling events and lymphokine production .
 ( protein: Ag receptor, None) , ( protein: lymphokine, 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: Ag receptor, None) , ( protein: lymphokine, None) 