| HO-1 | Heme oxygenase 1 |
| LC | Locus coeruleus |
| WT | Wild-type |
| NOS1 | Neuronal nitric oxide synthase |
| NOS2 | Inducible nitric oxide synthase |
| KO | Knockout |
| CFA | Complete Freund’s adjuvant |
| CoPP | Cobalt protoporphyrin IX |
| CORM-2 | Tricarbonyldichlororuthenium(II) dimer |
| ERK 1/2 | Extracellular signal-regulated kinase 1/2 |
| JNK | c-Jun N-terminal kinase |
| GAPDH | Glyceraldehyde-3-phosphate dehydrogenase |
| GFAP | Glial fibrillary acidic protein |
| SEM | Standard error of the mean |
| ANOVA | Analysis of variance |