{HEAD ~ Oct3/4}, Klf4, c Myc and Sox2 produce {TAIL ~ induced pluripotent stem cells} 
produce
{ HEAD ~ Oct3/4 } , Klf4 , c Myc and Sox2 produce { TAIL ~ induced pluripotent stem cells }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL