restriction endonuclease ecori digests of cole1 dna and various dnas containing the trp or gal operons were joined by t4 polynucleotide ligase [ polynucleotide synthetase ( atp ) , poly ( deoxyribonucleotide ) : poly ( deoxyribonucleotide ) ligase ( amp-forming ) , ec 6.5.1.1 ] .
C0032549
polynucleotide synthetase
C0023689
ligase