Table 1.

A table showing the differences in the A-, B- and Z-form DNA [7–8].

	A-form	B-form	Z-form
helix sense	right-handed	right-handed	left-handed
base pairs/turn	11	10.4	12
pitch per turn of Helix	25.3 Å	35.4 Å	45.6 Å
glycosyl bond	anti	anti	alternating anti and syn
sugar pucker	C3'-endo	C2'-endo	C:C2'-endo, G:C3'-endo
major groove	narrow and very deep	wide and quite deep	flat
minor groove	very broad and shallow	narrow and quite deep	very narrow and deep