Table 4: Isostericity Matrix for trans W

Table 5: Isostericity Matrix for cis W.C./Hoogsteen geometry.

	Hoogsteen
Watson-Crick		A	C	G	U
	A	X	X	I₃	(I₃)
	C	X	I₂	I₁	(I₁)
	G	I₃	X	I₄	X
	U	I₁	X	I₁	I₂