Table 8: Isostericity Matrix for trans Watson-Crick/Sugar Edge geometry.

Sugar Edge

Watson-Crick

A

C

G

U

A

I1

(I1)

I1

(I1)

C

I1

I1

I1

(I1)

G

X

I2

X

I2

U

I3

I3

I4

(I3)