| 5-HT | serotonin |
| CgA | chromogranin A |
| D2R | dopamine receptor 2 |
| GPCR | G-protein coupled receptor |
| INSM1 | insulinoma-associated protein 1 |
| MOR | µ-opioid receptor |
| NCAM1 | neural cell adhesion molecule 1 |
| NSE | neuron-specific enolase |
| RGS9 | regulator of G-protein signalling 9 |
| SST | somatostatin |
| SCLC | small-cell lung cancer |
| SSTR | somatostatin receptor |
| SYP | synaptophysin |