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IL-1α (a) and IL-1β (b) expression levels at different inflammatory cell infiltration grades in periapical granulomas. Mild, mild inflammatory cell infiltration subgroup (n = 16); Moderate, moderate inflammatory cell infiltration subgroup (n = 32); Severe, severe inflammatory cell infiltration subgroup (n = 37). * P < 0.05 and ** P < 0.01 compared with the mild inflammatory cell infiltration subgroup
