Rat Grimace Scale (RGS)
1. Orbital Tightening
Not present = 0
Moderately visible = 1
Pronounced = 2
2. Nose/Cheek Flattening
Not present = 0
Moderately visible = 1
Pronounced = 2
3. Ear Changes (position, orientation, shape)
Not present = 0
Moderately visible = 1
Pronounced = 2
4. Whisker Changes
Not present = 0
Moderately visible = 1
Pronounced = 2
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