Table 1.
Ribose/phosphate backbone | Adenine side chain | Guanine side chain | Cytosine side chain | Uracil side chain |
---|---|---|---|---|
P, OP1 | C2, N1 | C2, N1 | C2, N3 | C2, N3 |
P, OP2 | C2, N3 | C2, N2 | C2, O2 | C2, O2 |
P, O5′ | C4, N3 | C2, N3 | C4, N3 | C4, N3 |
C1′ , O4′ | C5, N7 | C4, N3 | C4, N4 | C4, O4 |
C2′ , O2′ | C6, N1 | C5, N7 | ||
C3′ , O3′ | C6, N6 | C6, N1 | ||
C4′ , O4′ | C8, N7 | C6, O6 | ||
C5′ , O5′ | C8, N7 |