Keratin Skin Tumors

This image shows Keratin 5 (red) and Keratin 1 (green) expression in skin tumors. Keratins are fibrous structural proteins present in epithelial structures, such as skin, hair, and nails. They form filaments that give strength and toughness to the structures. Keratins are often used to assist in the diagnosis of squamous cell carcinoma, a form of skin cancer.