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Polarization from M1 macrophages to M2 macrophages induced by ulinastatin. (A) Nuclei of pulmonary epithelial macrophages; (B) mRNA levels of M1 macrophage markers (IL-6, CD68, and ROS); (C) mRNA levels of M2 macrophage markers (Arg-1, MgI-1, and CD209). *P<0.05, **P<0.01 compared with the model group.
