form condition Base Rat Height diameter turn paIr paIr Brh92~95 10 363.38A19A 低Nat Amh75高Na+1132.7°2.56A23A RNA-DNA c rh66, Li 933386°32A19A D不含G 8 E不含G 7.5 Z富含GC 1230°371A18人 高K+form condition Base turn Rat pair Height pair diameter B rh92~95 低Na+ 10 36° 3.38 Ǻ 19 Ǻ A rh75,高Na+ RNA-DNA 11 32.7° 2.56 Ǻ 23 Ǻ C rh66, Li+ 9.33 38.6 ° 3.32 Ǻ 19 Ǻ D 不含G 8 E 不含G 7.5 Z 富含G-C 高K+ 12 30 ° 3.71 Ǻ 18 Ǻ