| TEWL | Trans-epidermal water loss |
| Klf-9 | Krüppel like factor 9 |
| SCN | Suprachiasmatic nucleus |
| CCGs | Clock controlled genes |
| PER | Period |
| CRY | Cryptochrome |
| GREs | Glucocorticoid response elements |
| NRs | Nuclear receptors |
| ATP | Adenosine Triphosphate |
| ROS | Reactive oxygen species |
| UV | Ultraviolet |
| UVR | Ultraviolet radiation |
| UVB | Ultraviolet B |
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