| m6A | N6-methyladenosine |
| Ψ | Pseudouridine |
| m5C | 5-methylcytidine |
| I | Inosine |
| m1A | N1-methyladenosine |
| m6Am | N6,2′-O-dimethyladenosine |
| Cap0, Cap1, Cap2 | 5′ cap modifications using m7G |
| m5U | 5-methyluridine |
| Am | 2′-O-methyladenosine |
| ac4C | N4-acetylcytidine |
| m7G | N7-methylguanosine |
| Gm | 2′-O-methylguanosine |
| Cm | 2′-O-methylcytidine |
| hm5C | 5-hydroxymethylcytidine |
| m6A/Ψ | m6A:Ψ comodified sites |