Triplex formation at physiological pH by 5-Me-dC-N4-(spermine) [X] oligodeoxynucleotides: non protonation of N3 in X of X*G:C triad and effect of base mismatch/ionic strength on triplex stabilities. - Barawkar DA; Rajeev KG; Kumar VA; Ganesh KN (Nucleic acids research, 1996)