Fig. 3

Immunohistochemical staining results of the spiral ganglion, organ of Corti, and stria vascularis of the cochlea under a light microscope (×200). A, D, and G are the staining results of the spiral ganglion, organ of Corti, and stria vascularis in the NC group, respectively; the cytoplasm was faintly stained or not stained  B, E, and H are the staining results of the spiral ganglion, organ of Corti, and stria vascularis in the OB group, respectively; the cytoplasm was stained mildly or moderately  C, F, and I are the staining results of the spiral ganglion, organ of Corti, and stria vascularis in the T2DM group, respectively; the cytoplasmic staining is significantly deep and visible, and there are significantly more brownish-yellow particles distributed at ×200