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Hematoxylin-eosin staining of the lung. Normal control group (A), SAP group (B: 24 h after L-arginine injection; C: 48 h after L-arginine injection; D: 72 h after L-arginine injection), PBS group (E) and rIL-22 group (F). Original magnification × 200. SAP: Acute severe pancreatitis; PBS: Phosphate-buffered saline; rIL-22: Recombinant interleukin-22.
