complete energy minimizations were performed for ( a ) the ten base-pair combinations of dinucleoside phosphates , starting from a b-dna conformation , ( b ) six hexanucleoside pentaphosphates -- base-paired cgcgcg , gcgcgc , g6-c6 , tatata , atatat , and a6-t6 -- starting with a b-dna geometry , and ( c ) the four hexanucleoside pentaphosphates that have alternating pyrimidine-purine sequences , starting with a z-dna geometry .
C0012854
dna
C0043442
z-dna