Base pairs of DNA from B form (PDB 1bna), A form (PDB 1ana), and Z form (2dcg).

A and B DNA have one G-C pair and one A-T pair. Z DNA shows two G-C pairs. Hydrogen bonds are shown between bases.

Phosphates on the 5' ends are missing one Oxygen so that if multiple files are printed, they may be glued together with the 3' Oxygen to form a longer chain if desired.

 

Stick models are meant to show sugar puckers and torsion angles.