20% PAGE analysis of polycondensation products. Initial conditions in all the cases are: 20 mM dinucleotide, 0.4 M EDC, 0.1 M HEPES, pH 7.55, 2°C. All gels are stained with SybrGold® gel stain for 20 min. Line M is a marker line. (A) nCGp, (B) nTAp, (C) nTGp and nCAp copolymerization, (D) nTGCAp, (E) nCATGp, (F) nTGTACAp.