Keratin
Keratin.
Keratin
Nails are made of up the protein called keratin, which is a tough and insoluble structual protein. It is basically dead skin cells.
keratin
Keratin- fibrous protein that makes up human skin, nails, hair etc.
Keratin is the tough, waterproof protein abundant in the stratum corneum, the outermost layer of the epidermis.
iron
Keratin is the protein that strengthens and waterproofs the epidermal layer of the skin.
This is found in the stratum corneum (horny layer), the most most superficial layer which are dead cells filled with keratin. They form a waterproof barrier and make it tough.
Nails are made of iron. If you are as tough as iron then you are really tough.
Horse hooves are made of a tough protein called keratin – the same stuff our nails and hair are made of. Answer By: BlueHorse211
Squamous cells.