Salt-induced Z-A-Z transition sequence in the mixed ribo-deoxyribo copolymer poly(rG-dC) X po

The left-handed helical conformation of various polynucleotides has been seen in solution at higher salt concentration than has the right-handed helical conformation of the corresponding polymer. We report here, however, studies of conformational transitions in the mixed polymer poly-(rG-dC) X poly(rG-dC). This polynucleotide appears to exist ..