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