Fig. 1From: Increased interleukin 1α and interleukin 1β expression is involved in the progression of periapical lesions in primary teethIL-1α and IL-1β distribution in periapical lesions. The IL-1-positive cells display brown staining. Neg: negative control. Yellow arrow: inflammatory cells. Red arrow: epithelial cells. Black arrow: vascular endothelium. The scale bar is 50 μmBack to article page