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Categories of formalin-induced nociception behaviors in rats
| Pain behavior scale | Pain score |
|---|---|
| Rat stands or walks firmly on injected paw | 0 |
| The injected paw was not fully lifted | 1 |
| The injected paw was wholly lifted off the floor | 2 |
| The rat licked or chewed the injected paw | 3 |
