these oligonucleotides were fractionated first be deae-cellulose chromatography with 7 m urea into the respective isoplithic groups and then analysed for the composition and isomerism : each group was labeled 5'-terminally by the [ gamma-32p ] atp-polynucleotide kinase reaction and then electrophoresed monodimensionally for the dinucleotides and two-dimensionally for the di- and trinucleotides mixtures , respectively , followed by elution and digestion with snake venom exonuclease .
C0028953
oligonucleotides
C0032550
polynucleotide