He shared the 1993 Nobel Prize in Physiology or Medicine with Richard J. Roberts for `` the discovery that genes in eukaryotes are not contiguous strings but contain introns , and that the splicing of messenger RNA to delete those introns can occur in different ways , yielding different proteins from the same DNA sequence '' .
He co-discovered gene splicing , and shared the 1993 Nobel Prize in Physiology or Medicine with Richard Roberts for `` the discovery that genes in eukaryotes are not contiguous strings but contain introns , and that the splicing of pre-messenger RNA to delete those introns can occur in different ways , yielding different proteins from the same DNA sequence '' .