Nucleoside(C1-N1 or C1-N9 Adenosine Guanosine Cytidine Uridine Pseudouridine(u): C1-C5Nucleoside(C1-N1 or C1-N9) • Adenosine • Guanosine • Cytidine • Uridine • Pseudouridine(ψ):C1-C5