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Corneous is a biological and medical term meaning horny , in other words made out of a substance similar to that of horn s and hooves in some mammal s. The word is generally used to describe natural or pathological anatomical structures made out of a hard layer of protein .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None