Figure 6.

Crystal structure of tRNA [NDBID TR0001 (13)]. (A) The 3D structure. Color code is the same as in Figure 4. The secondary structure (B) was obtained directly from the RNAview program without further modification. The red single dashed lines mean that the base pair involve only one H-bond. The modified bases are given the corresponding lower case letter. The letter P means pseudouracil. The four red letters (a, A, G, g) indicate that the nucleic acids have syn conformations. Modified bases are given as lower case.