two fluorescent donors , 8-mercapto-atp alkylated with either 5- [ [ [ ( iodoacetyl ) amino ] ethyl ] amino ] naphthalene-1-sulfonic acid ( aedans-atp ) or 1 , n6-etheno-2-aza-atp ( aza-epsilon-atp ) , and two acceptors , 6-mercaptopurine ribonucleotide triphosphate or 8-mercapto-atp alkylated with the chromophore 4'- [ [ 4- ( dimethylamino ) -phenyl ] azo ] -2-iodoacetanilide ( 6-y- or 8-y-atp ) , were used .
C0004482
aza
C0000618
ribonucleotide