| ABP | Adenine-based purines |
| GBP | Guanosine-based purines |
| ATP | Adenosine triphosphate |
| ADP | Adenosine diphosphate |
| AMP | Adenosine monophosphate |
| GTP | Guanosine triphosphate |
| GDP | Guanosine diphosphate |
| GMP | Guanosine monophosphate |
| IMP | Inosine monophosphate |
| ACh | Acetylcholine |
| NGF | Nerve growth factor |
| UTP | Uridine triphosphate |
| TTP | Thymidine triphosphate |
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