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(A) Immunohistochemical analysis of ET-1, NOS2 and EGFR in different groups (×100). OD values of (B) ET-1, (C) NOS2 and (D) EGFR (Compared with normal group, ## p < 0.01; compared with model group, * p < 0.05, ** p < 0.01). (OD value: optical density value)
