Figure 2. Histological features of cow skin. Hematoxylin and eosin staining (A-C; G-H); Crossman's trichrome staining (D-F); and PAS staining (I) of cow skin tissue sections. (E) Keratinized stratified squamous epithelium of the epidermis; (PL) Papillary layer of the dermis; (RL) Reticular layer of the dermis; (HD) Hypodermis; (SG) Sebaceous glands; (Black arrow) fibrocytes; (Arrow heads) collagen bundles of the reticular layer; (Yellow arrow) Sweat glands; (HF) Hair follicles; (H) Hair; (C) Cuticle; (IRS) Inner root sheath; (ORS) Outer root sheath.