{HEAD ~ Products} generated by {TAIL ~ the 3′ and 5′ RACE procedures} can be combined to generate full length cDNAs (Frohman and Martin Techniques 1:165) 
generated by
{ HEAD ~ Products } generated by { TAIL ~ the 3′ and 5′ RACE procedures } can be combined to generate full length cDNAs ( Frohman and Martin Techniques 1:165 )
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH