Fig. 4From: Protective role of the alpha-1-antitrypsin in intervertebral disc degenerationThe rat tail discs were injected with PBS, TNF-α (25 ng/mL), and TNF-α (25 ng/mL + ATT (10 μM), maintained for 1 month. A Whole tail discs were observed using safranine O staining. B Safranine O staining images according to histological grading scale *p < 0.05 versus PBS. *p < 0.05 versus ATTBack to article page