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The keratin in the epidermis, when thickened and cornified, is referred to as '''horn'''.  Horn is particularly resistant to mechanical and chemical damage.  The outer surface of the hoof is composed of horn.  
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The keratin in the epidermis, when thickened and cornified, is referred to as [[Horn - Anatomy & Physiology|horn]].  Horn is particularly resistant to mechanical and chemical damage.  The outer surface of the hoof is composed of horn.  
    
==Structure and Function==
 
==Structure and Function==
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