13448
IL-12 is a 75-kDa heterodimeric cytokine composed of two covalently linked p35 and p40 chains .
 ( protein: IL-12, None) , ( protein: 75-kDa heterodimeric cytokine, 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: IL-12, None) , ( protein: 75-kDa heterodimeric cytokine, None) 