| ATF | Activating transcription factor |
| Ca | Calcium |
| Cd | Cadmium |
| CREB | cAMP responsive element |
| MT | Metallothionein |
| MTF-1 | Metal transcription factor 1 |
| pATF | Phosphorylated ATF |
| pCREB | Phosphorylated CREB |
| ROI | Region of interest |
| TF | Transcription factor |
| wMT-2 | Earthworm metallothionein 2 |
| Zn | Zinc |